diff --git a/docs/SUMMARY.md b/docs/SUMMARY.md
index ab998e9d83..d61b1debae 100644
--- a/docs/SUMMARY.md
+++ b/docs/SUMMARY.md
@@ -6,6 +6,7 @@
 - [rpc-provider](rpc-provider/README.md)
   - [HttpProvider](rpc-provider/classes/_http_index_.httpprovider.md)
   - [WsProvider](rpc-provider/classes/_ws_index_.wsprovider.md)
+- [types (codec implementation)](types/README.md)
 
 ## Interfaces
 
diff --git a/packages/types/src/AccountId.ts b/packages/types/src/AccountId.ts
index 8f8e5d9ac6..aa9bef0198 100644
--- a/packages/types/src/AccountId.ts
+++ b/packages/types/src/AccountId.ts
@@ -9,9 +9,13 @@ import { hexToU8a, isHex, isString, isU8a, u8aToU8a } from '@polkadot/util';
 
 import U8aFixed from './codec/U8aFixed';
 
-// A wrapper around an AccountId/PublicKey representation. Since we are dealing with
-// underlying PublicKeys (32 bytes in length), we extend from U8aFixed which is
-// just a Uint8Array wrapper with a fixed length.
+/**
+ * @name AccountId
+ * @description
+ * A wrapper around an AccountId/PublicKey representation. Since we are dealing with
+ * underlying PublicKeys (32 bytes in length), we extend from U8aFixed which is
+ * just a Uint8Array wrapper with a fixed length.
+ */
 export default class AccountId extends U8aFixed {
   constructor (value: AnyU8a = new Uint8Array()) {
     super(
diff --git a/packages/types/src/AccountIndex.ts b/packages/types/src/AccountIndex.ts
index 99bee00fda..8a6dae0813 100644
--- a/packages/types/src/AccountIndex.ts
+++ b/packages/types/src/AccountIndex.ts
@@ -20,9 +20,12 @@ const MAX_1BYTE = new BN(PREFIX_1BYTE);
 const MAX_2BYTE = new BN(1).shln(16);
 const MAX_4BYTE = new BN(1).shln(32);
 
-// A wrapper around an AccountIndex, which is a shortened, variable-length encoding
-// for an Account. We extends from U8a which is basically
-// just a Uint8Array wrapper.
+/**
+ * @name AccountIndex
+ * @description
+ * A wrapper around an AccountIndex, which is a shortened, variable-length encoding
+ * for an Account. We extends from [[U32]] to provide the number-like properties.
+ */
 export default class AccountIndex extends U32 {
   constructor (value: AnyNumber = new BN(0)) {
     super(
diff --git a/packages/types/src/Address.ts b/packages/types/src/Address.ts
index b0d14ea554..c17eeea25e 100644
--- a/packages/types/src/Address.ts
+++ b/packages/types/src/Address.ts
@@ -14,11 +14,14 @@ type AnyAddress = BN | Address | AccountId | AccountIndex | Array<number> | Uint
 
 export const ACCOUNT_ID_PREFIX = new Uint8Array([0xff]);
 
-// A wrapper around an AccountId and/or AccountIndex that is encoded with a prefix.
-// Since we are dealing with underlying publicKeys (or shorter encoded addresses),
-// we extend from Base with an AccountId/AccountIndex wrapper. Basically the Address
-// is encoded as
-//   [ <prefix-byte>, ...publicKey/...bytes ]
+/**
+ * @name Address
+ * @description
+ * A wrapper around an AccountId and/or AccountIndex that is encoded with a prefix.
+ * Since we are dealing with underlying publicKeys (or shorter encoded addresses),
+ * we extend from Base with an AccountId/AccountIndex wrapper. Basically the Address
+ * is encoded as `[ <prefix-byte>, ...publicKey/...bytes ]` as per spec
+ */
 export default class Address extends Base<AccountId | AccountIndex> {
   constructor (value: AnyAddress = new Uint8Array()) {
     super(
@@ -58,12 +61,6 @@ export default class Address extends Base<AccountId | AccountIndex> {
       : new AccountIndex(u8aToBn(decoded, true));
   }
 
-  get rawLength (): number {
-    return this.raw instanceof AccountIndex
-      ? AccountIndex.calcLength(this.raw)
-      : this.raw.encodedLength;
-  }
-
   get encodedLength (): number {
     const rawLength = this.rawLength;
 
@@ -75,6 +72,12 @@ export default class Address extends Base<AccountId | AccountIndex> {
     );
   }
 
+  get rawLength (): number {
+    return this.raw instanceof AccountIndex
+      ? AccountIndex.calcLength(this.raw)
+      : this.raw.encodedLength;
+  }
+
   toHex (): string {
     return u8aToHex(this.toU8a());
   }
diff --git a/packages/types/src/Balance.ts b/packages/types/src/Balance.ts
index fc10e5c88d..36bce420c7 100644
--- a/packages/types/src/Balance.ts
+++ b/packages/types/src/Balance.ts
@@ -4,6 +4,10 @@
 
 import U128 from './U128';
 
-// The Substrate Balance representation.
+/**
+ * @name Balance
+ * @description
+ * The Substrate Balance representation as a [[U128]].
+ */
 export default class Balance extends U128 {
 }
diff --git a/packages/types/src/Bft.ts b/packages/types/src/Bft.ts
index 5cb283102b..90a65a2215 100644
--- a/packages/types/src/Bft.ts
+++ b/packages/types/src/Bft.ts
@@ -14,8 +14,12 @@ export type BftAuthoritySignatureValue = {
   signature?: AnyU8a
 };
 
-// Represents a Bft Hash and Signature pairing, typically used in reporting
-// network behaviour.
+/**
+ * @name BftAuthoritySignature
+ * @description
+ * Represents a Bft Hash and Signature pairing, typically used in reporting
+ * network behaviour.
+ */
 export class BftAuthoritySignature extends Tuple {
   constructor (value?: BftAuthoritySignatureValue | Uint8Array) {
     super({
@@ -38,8 +42,12 @@ export type BftHashSignatureValue = {
   signature?: AnyU8a
 };
 
-// Represents a Bft Hash and Signature pairing, typically used in reporting
-// network behaviour.
+/**
+ * @name BftHashSignature
+ * @description
+ * Represents a Bft Hash and Signature pairing, typically used in reporting
+ * network behaviour.
+ */
 export class BftHashSignature extends Tuple {
   constructor (value?: BftHashSignatureValue | Uint8Array) {
     super({
diff --git a/packages/types/src/Block.ts b/packages/types/src/Block.ts
index 2ad538a8e5..3c383551b6 100644
--- a/packages/types/src/Block.ts
+++ b/packages/types/src/Block.ts
@@ -16,7 +16,11 @@ export type BlockValue = {
   header?: HeaderValue
 };
 
-// A block encoded with header and extrinsics
+/**
+ * @name Block
+ * @description
+ * A block encoded with header and extrinsics
+ */
 export default class Block extends Struct {
   constructor (value?: BlockValue | Uint8Array) {
     super({
diff --git a/packages/types/src/BlockNumber.ts b/packages/types/src/BlockNumber.ts
index 722fbf4323..41450a74df 100644
--- a/packages/types/src/BlockNumber.ts
+++ b/packages/types/src/BlockNumber.ts
@@ -4,5 +4,10 @@
 
 import U64 from './U64';
 
+/**
+ * @name BlockNumber
+ * @description
+ * A representation of a Substrate BlockNumber, implemented as a [[U64]]
+ */
 export default class BlockNumber extends U64 {
 }
diff --git a/packages/types/src/Bool.ts b/packages/types/src/Bool.ts
index 12035eefef..bab3f3ea44 100644
--- a/packages/types/src/Bool.ts
+++ b/packages/types/src/Bool.ts
@@ -6,6 +6,11 @@ import { isU8a, u8aToHex } from '@polkadot/util';
 
 import { Codec } from './types';
 
+/**
+ * @name Bool
+ * @description
+ * Representation for a boolean value in the system
+ */
 export default class Bool extends Boolean implements Codec {
   constructor (value: Bool | Boolean | Uint8Array | boolean | number = false) {
     super(
@@ -35,11 +40,11 @@ export default class Bool extends Boolean implements Codec {
     return u8aToHex(this.toU8a());
   }
 
-  toU8a (isBare?: boolean): Uint8Array {
-    return new Uint8Array([this ? 1 : 0]);
-  }
-
   toString (): string {
     return `${this.toJSON()}`;
   }
+
+  toU8a (isBare?: boolean): Uint8Array {
+    return new Uint8Array([this ? 1 : 0]);
+  }
 }
diff --git a/packages/types/src/Bytes.ts b/packages/types/src/Bytes.ts
index 317f926a6b..85bea7b791 100644
--- a/packages/types/src/Bytes.ts
+++ b/packages/types/src/Bytes.ts
@@ -8,9 +8,13 @@ import { AnyU8a } from './types';
 import Compact from './codec/Compact';
 import U8a from './codec/U8a';
 
-// A Bytes wrapper for Vec<u8>. The significant difference between this and a normal Uint8Array
-// is that this version allows for length-encoding. (i.e. it is a variable-item codec, the same
-// as what is found in Text and Vector)
+/**
+ * @name Bytes
+ * @description
+ * A Bytes wrapper for Vec<u8>. The significant difference between this and a normal Uint8Array
+ * is that this version allows for length-encoding. (i.e. it is a variable-item codec, the same
+ * as what is found in [[Text]] and [[Vector]])
+ */
 export default class Bytes extends U8a {
   constructor (value: AnyU8a) {
     super(Bytes.decodeBytes(value));
diff --git a/packages/types/src/Data.ts b/packages/types/src/Data.ts
index 670fc9ead0..710b656a55 100644
--- a/packages/types/src/Data.ts
+++ b/packages/types/src/Data.ts
@@ -4,6 +4,10 @@
 
 import U8a from './codec/U8a';
 
-// A raw data structure. It is just an encoding of a U8a, without any length encoding
+/**
+ * @name Data
+ * @description
+ * A raw data structure. It is just an encoding of a U8a, without any length encoding
+ */
 export default class Data extends U8a {
 }
diff --git a/packages/types/src/Digest.ts b/packages/types/src/Digest.ts
index b98a077df1..988df4a36a 100644
--- a/packages/types/src/Digest.ts
+++ b/packages/types/src/Digest.ts
@@ -12,16 +12,36 @@ import Hash from './Hash';
 import Signature from './Signature';
 import U64 from './U64';
 
-class AuthoritiesChange extends Vector.with(AuthorityId) {
+/**
+ * @name AuthoritiesChange
+ * @description
+ * Log for Authories changed
+ */
+export class AuthoritiesChange extends Vector.with(AuthorityId) {
 }
 
-class ChangesTrieRoot extends Hash {
+/**
+ * @name ChangesTrieRoot
+ * @description
+ * Log for changes to the Trie root
+ */
+export class ChangesTrieRoot extends Hash {
 }
 
-class Other extends Bytes {
+/**
+ * @name Other
+ * @description
+ * Log item that is just a stream of [[Bytes]]
+ */
+export class Other extends Bytes {
 }
 
-class Seal extends Tuple {
+/**
+ * @name Seal
+ * @description
+ * Log item indicating a sealing event
+ */
+export class Seal extends Tuple {
   constructor (value: any) {
     super({
       slot: U64,
@@ -38,6 +58,11 @@ class Seal extends Tuple {
   }
 }
 
+/**
+ * @name DigestItem
+ * @description
+ * A [[EnumType]] the specifies the specific item in the logs of a [[Digest]]
+ */
 export class DigestItem extends EnumType<AuthoritiesChange | ChangesTrieRoot | Other
 | Seal> {
   constructor (value: any) {
@@ -50,6 +75,11 @@ export class DigestItem extends EnumType<AuthoritiesChange | ChangesTrieRoot | O
   }
 }
 
+/**
+ * @name Digest
+ * @description
+ * A [[Header]] Digest
+ */
 export default class Digest extends Struct {
   constructor (value: any) {
     super({
diff --git a/packages/types/src/Event.ts b/packages/types/src/Event.ts
index 7a07584f64..9bf1ff710b 100644
--- a/packages/types/src/Event.ts
+++ b/packages/types/src/Event.ts
@@ -14,7 +14,12 @@ import Metadata, { EventMetadata } from './Metadata';
 
 const EventTypes: { [index: string]: Constructor<EventData> } = {};
 
-class EventData extends Tuple {
+/**
+ * @name EventData
+ * @description
+ * Wrapper for the actual data that forms part of an [[Event]]
+ */
+export class EventData extends Tuple {
   private _meta: EventMetadata;
   private _method: string;
   private _section: string;
@@ -46,13 +51,24 @@ class EventData extends Tuple {
   }
 }
 
-// like methods, we have the [sectionIndex, methodIndex] pairing
-class EventIndex extends U8aFixed {
+/**
+ * @name EventIndex
+ * @description
+ * This follows the same approach as in [[Method]], we have the `[sectionIndex, methodIndex]` pairing
+ * that indicates the actual event fired
+ */
+export class EventIndex extends U8aFixed {
   constructor (value?: any) {
     super(value, 16);
   }
 }
 
+/**
+ * @name Event
+ * @description
+ * A representation of a system event. These are generated via the [[Metadata]] interfaces and
+ * specific to a specific Substrate runtime
+ */
 export default class Event extends Struct {
   // Currently we _only_ decode from Uint8Array, since we expect it to
   // be used via EventRecord
diff --git a/packages/types/src/EventRecord.ts b/packages/types/src/EventRecord.ts
index ae07528b01..3e89845887 100644
--- a/packages/types/src/EventRecord.ts
+++ b/packages/types/src/EventRecord.ts
@@ -8,13 +8,28 @@ import Event from './Event';
 import Null from './Null';
 import U32 from './U32';
 
-class ApplyExtrinsic extends U32 {
+/**
+ * @name ApplyExtrinsic
+ * @description
+ * The [[Phase]] where the extrinsic is applied
+ */
+export class ApplyExtrinsic extends U32 {
 }
 
-class Finalization extends Null {
+/**
+ * @name Finalization
+ * @description
+ * The [[Phase]] where the extrinsic is being Finalized
+ */
+export class Finalization extends Null {
 }
 
-class Phase extends EnumType<ApplyExtrinsic | Finalization> {
+/**
+ * @name Phase
+ * @description
+ * An [[EnumType]] that indicates the specific phase where the [[EventRecord]] was generated
+ */
+export class Phase extends EnumType<ApplyExtrinsic | Finalization> {
   constructor (value: any, index?: number) {
     super([
       ApplyExtrinsic,
@@ -23,6 +38,12 @@ class Phase extends EnumType<ApplyExtrinsic | Finalization> {
   }
 }
 
+/**
+ * @name EventRecord
+ * @description
+ * A record for an [[Event]] (as specified by [[Metadata]]) with the specific [[Phase]] of
+ * application.
+ */
 export default class EventRecord extends Struct {
   constructor (value: any) {
     super({
diff --git a/packages/types/src/Extrinsic.ts b/packages/types/src/Extrinsic.ts
index 97ec7820b1..31d85f8c43 100644
--- a/packages/types/src/Extrinsic.ts
+++ b/packages/types/src/Extrinsic.ts
@@ -22,6 +22,8 @@ type ExtrinsicValue = {
 };
 
 /**
+ * @name Extrinsic
+ * @description
  * Representation of an Extrinsic in the system. It contains the actual call,
  * (optional) signature and encodes with an actual length prefix
  *
@@ -75,6 +77,12 @@ export default class Extrinsic extends Struct {
     return this.method.data;
   }
 
+  get encodedLength (): number {
+    const length = this.length;
+
+    return length + Compact.encodeU8a(length).length;
+  }
+
   // convernience, encodes the extrinsic and returns the actual hash
   get hash (): Hash {
     return new Hash(
@@ -102,12 +110,6 @@ export default class Extrinsic extends Struct {
     return this.get('signature') as ExtrinsicSignature;
   }
 
-  get encodedLength (): number {
-    const length = this.length;
-
-    return length + Compact.encodeU8a(length).length;
-  }
-
   addSignature (signer: Address | Uint8Array, signature: Uint8Array, nonce: AnyNumber, era?: Uint8Array): Extrinsic {
     this.signature.addSignature(signer, signature, nonce, era);
 
@@ -120,14 +122,6 @@ export default class Extrinsic extends Struct {
     return this;
   }
 
-  toU8a (isBare?: boolean): Uint8Array {
-    const encoded = super.toU8a();
-
-    return isBare
-      ? encoded
-      : Compact.addLengthPrefix(encoded);
-  }
-
   toHex (): string {
     return u8aToHex(this.toU8a());
   }
@@ -135,4 +129,12 @@ export default class Extrinsic extends Struct {
   toJSON (): any {
     return this.toHex();
   }
+
+  toU8a (isBare?: boolean): Uint8Array {
+    const encoded = super.toU8a();
+
+    return isBare
+      ? encoded
+      : Compact.addLengthPrefix(encoded);
+  }
 }
diff --git a/packages/types/src/ExtrinsicEra.ts b/packages/types/src/ExtrinsicEra.ts
index e8b556fdee..efd9da9168 100644
--- a/packages/types/src/ExtrinsicEra.ts
+++ b/packages/types/src/ExtrinsicEra.ts
@@ -8,6 +8,11 @@ import { u8aToU8a } from '@polkadot/util';
 
 import U8a from './codec/U8a';
 
+/**
+ * @name ExtrinsicEra
+ * @description
+ * The era for an extrinsic, indicating either a mortal or immortal extrinsic
+ */
 export default class ExtrinsicEra extends U8a {
   constructor (value?: AnyU8a) {
     super(
diff --git a/packages/types/src/ExtrinsicSignature.ts b/packages/types/src/ExtrinsicSignature.ts
index ce7a172ff5..fb81f44d10 100644
--- a/packages/types/src/ExtrinsicSignature.ts
+++ b/packages/types/src/ExtrinsicSignature.ts
@@ -29,12 +29,17 @@ const BIT_UNSIGNED = 0;
 const BIT_VERSION = 0b0000001;
 const EMPTY_U8A = new Uint8Array();
 
-// Signature Information.
-//   1/3/5/9/33 bytes: The signing account identity, in Address format
-//   64 bytes: The Ed25519 signature of the Signing Payload
-//   8 bytes: The Transaction Index of the signing account
-//   1/2 bytes: The Transaction Era
+/**
+ * @name ExtrinsicSignature
+ * @description
+ * A container for the [[Signature]] associated with a specific [[Extrinsic]]
+ */
 export default class ExtrinsicSignature extends Struct {
+  // Signature Information.
+  //   1/3/5/9/33 bytes: The signing account identity, in Address format
+  //   64 bytes: The Ed25519 signature of the Signing Payload
+  //   8 bytes: The Transaction Index of the signing account
+  //   1/2 bytes: The Transaction Era
   constructor (value?: ExtrinsicSignatureValue | Uint8Array) {
     super({
       signer: Address,
diff --git a/packages/types/src/ExtrinsicStatus.ts b/packages/types/src/ExtrinsicStatus.ts
index b5dfab51e1..8e47dd3ace 100644
--- a/packages/types/src/ExtrinsicStatus.ts
+++ b/packages/types/src/ExtrinsicStatus.ts
@@ -8,18 +8,43 @@ import Hash from './Hash';
 import Null from './Null';
 import Text from './Text';
 
+/**
+ * @name Broadcast
+ * @description
+ * An [[ExtrinsicStatus]] indicating that the [[Extrinsic]] has been boradcast to peers
+ */
 export class Broadcast extends Vector.with(Text) {
 }
 
+/**
+ * @name Dropped
+ * @description
+ * An [[ExtrinsicStatus]] indicating that the [[Extrinsic]] has been dropped
+ */
 export class Dropped extends Null {
 }
 
+/**
+ * @name Finalised
+ * @description
+ * An [[ExtrinsicStats] indicating that the [[Extrinsic]]] has been finalised and included
+ */
 export class Finalised extends Hash {
 }
 
+/**
+ * @name Usurped
+ * @description
+ * An [[ExtrinsicStatus]] indicating that the [[Extrinsic]] has been usurped
+ */
 export class Usurped extends Hash {
 }
 
+/**
+ * @name ExtrinsicStatus
+ * @description
+ * An [[EnumType]] that indicates the status of the [[Extrinsic]] as been submitted
+ */
 export default class ExtrinsicStatus extends EnumType<Finalised | Usurped | Broadcast | Dropped> {
   constructor (value: any, index?: number) {
     super([
diff --git a/packages/types/src/Extrinsics.ts b/packages/types/src/Extrinsics.ts
index 078c089dd9..09712c0732 100644
--- a/packages/types/src/Extrinsics.ts
+++ b/packages/types/src/Extrinsics.ts
@@ -5,6 +5,10 @@
 import Vector from './codec/Vector';
 import Extrinsic from './Extrinsic';
 
-// A list of extrinsics
+/**
+ * @name Extrinsics
+ * @description
+ * A [[Vector]] of [[Extrinsic]]
+ */
 export default class Extrinsics extends Vector.with(Extrinsic) {
 }
diff --git a/packages/types/src/Gas.ts b/packages/types/src/Gas.ts
index 20b1ada671..3b536f42b9 100644
--- a/packages/types/src/Gas.ts
+++ b/packages/types/src/Gas.ts
@@ -4,6 +4,10 @@
 
 import U64 from './U64';
 
-// Gas for contracts
+/**
+ * @name Gas
+ * @description
+ * A gas number type for Substrate, extending [[U64]]
+ */
 export default class Gas extends U64 {
 }
diff --git a/packages/types/src/H256.ts b/packages/types/src/H256.ts
index 347fad3d76..de6dbaadce 100644
--- a/packages/types/src/H256.ts
+++ b/packages/types/src/H256.ts
@@ -6,8 +6,12 @@ import { AnyU8a } from './types';
 
 import U8aFixed from './codec/U8aFixed';
 
-// Hash containing 256 bits (32 bytes), typically used in blocks, extrinsics and
-// as a sane default for fixed-length hash representations.
+/**
+ * @name H256
+ * @description
+ * Hash containing 256 bits (32 bytes), typically used in blocks, extrinsics and
+ * as a sane default for fixed-length hash representations.
+ */
 export default class H256 extends U8aFixed {
   constructor (value?: AnyU8a) {
     super(value, 256);
diff --git a/packages/types/src/H512.ts b/packages/types/src/H512.ts
index c48ddcc622..89e04f12f5 100644
--- a/packages/types/src/H512.ts
+++ b/packages/types/src/H512.ts
@@ -6,7 +6,11 @@ import { AnyU8a } from './types';
 
 import U8aFixed from './codec/U8aFixed';
 
-// Hash containing 512 bits (64 bytes), typically used for signatures
+/**
+ * @name H512
+ * @description
+ * Hash containing 512 bits (64 bytes), typically used for signatures
+ */
 export default class H512 extends U8aFixed {
   constructor (value?: AnyU8a) {
     super(value, 512);
diff --git a/packages/types/src/Hash.ts b/packages/types/src/Hash.ts
index a5efe7ed3f..60b7896c38 100644
--- a/packages/types/src/Hash.ts
+++ b/packages/types/src/Hash.ts
@@ -4,7 +4,11 @@
 
 import H256 from './H256';
 
-// The default hash that is used accross the system. It is basically just a thin
-// wrapper around H256, representing a 32-byte blake2b (Substrate) value
+/**
+ * @name Hash
+ * @description
+ * The default hash that is used accross the system. It is basically just a thin
+ * wrapper around [[H256]], representing a 32-byte blake2b (Substrate) value
+ */
 export default class Hash extends H256 {
 }
diff --git a/packages/types/src/Header.ts b/packages/types/src/Header.ts
index 643bc043bf..72ce4c78be 100644
--- a/packages/types/src/Header.ts
+++ b/packages/types/src/Header.ts
@@ -21,7 +21,11 @@ export type HeaderValue = {
   stateRoot?: AnyU8a
 };
 
-// A block header.
+/**
+ * @name Header
+ * @description
+ * A [[Block]] header
+ */
 export default class Header extends Struct {
   constructor (value?: HeaderValue | Uint8Array) {
     super({
diff --git a/packages/types/src/Justification.ts b/packages/types/src/Justification.ts
index 5fbfaba417..bfea3f4c11 100644
--- a/packages/types/src/Justification.ts
+++ b/packages/types/src/Justification.ts
@@ -17,11 +17,19 @@ export type RhdJustificationValue = {
   signatures?: Array<BftAuthoritySignatureValue>
 };
 
-// generic justification, this is specific per consensus implementation
+/**
+ * @name Justification
+ * @description
+ * A generic justification as a stream of [[Bytes]], this is specific per consensus implementation
+ */
 export default class Justification extends Bytes {
 }
 
-// justification for Rhododendron
+/**
+ * @name RhdJustification
+ * @description
+ * [[Justification]] for the Rhododendron consensus algorithm
+ */
 export class RhdJustification extends Struct {
   constructor (value?: RhdJustificationValue | Uint8Array) {
     super({
diff --git a/packages/types/src/KeyValue.ts b/packages/types/src/KeyValue.ts
index efd1e7094e..ba727cbd27 100644
--- a/packages/types/src/KeyValue.ts
+++ b/packages/types/src/KeyValue.ts
@@ -15,10 +15,14 @@ type KeyValueValue = {
   value?: AnyU8a
 };
 
-// KeyValue structure. Since most of the keys and resultant values in Subtrate is
-// hashed and/or encoded, this does not wrap a Text, but rather a Bytes
-// for the keys and values. (Not to be confused with the KeyValue in Metadata, that
-// is actually for Maps, whereas this is a representation of actaul storage values)
+/**
+ * @name KeyValue
+ * @description
+ * KeyValue structure. Since most of the keys and resultant values in Subtrate is
+ * hashed and/or encoded, this does not wrap [[Text]], but rather a [[Bytes]]
+ * for the keys and values. (Not to be confused with the KeyValue in [[Metadata]], that
+ * is actually for Maps, whereas this is a representation of actaul storage values)
+ */
 export default class KeyValue extends Struct {
   constructor (value?: KeyValueValue | Uint8Array) {
     super({
@@ -41,9 +45,13 @@ export type KeyValueOptionValue = {
   value?: AnyU8a
 };
 
-// A key/value change. This is similar to the KeyValue structure,
-// however in this case the value could be optional. Here it extends
-// from a Tuple, indicating the use inside areas such as StorageChangeSet
+/**
+ * @name KeyValueOption
+ * @description
+ * A key/value change. This is similar to the [[KeyValue]] structure,
+ * however in this case the value could be optional. Here it extends
+ * from a [[Tuple]], indicating the use inside areas such as [[StorageChangeSet]]
+ */
 export class KeyValueOption extends Tuple {
   constructor (value?: KeyValueOptionValue | Uint8Array) {
     super({
diff --git a/packages/types/src/Metadata.ts b/packages/types/src/Metadata.ts
index d7fafb70d5..a95176d0fc 100644
--- a/packages/types/src/Metadata.ts
+++ b/packages/types/src/Metadata.ts
@@ -334,6 +334,11 @@ export class RuntimeModuleMetadata extends Struct {
   }
 }
 
+/**
+ * @name Metadata
+ * @description
+ * The runtime metadata as a decoded structure
+ */
 export default class RuntimeMetadata extends Struct {
   constructor (value?: any) {
     super({
diff --git a/packages/types/src/Method.ts b/packages/types/src/Method.ts
index 0b6b255f0a..f168a763c9 100644
--- a/packages/types/src/Method.ts
+++ b/packages/types/src/Method.ts
@@ -57,6 +57,8 @@ class MethodIndex extends U8aFixed {
 }
 
 /**
+ * @name Method
+ * @description
  * Extrinsic function descriptor, as defined in
  * {@link https://github.com/paritytech/wiki/blob/master/Extrinsic.md#the-extrinsic-format-for-node}.
  */
diff --git a/packages/types/src/MisbehaviorReport.ts b/packages/types/src/MisbehaviorReport.ts
index 178d5c9828..a560de55cd 100644
--- a/packages/types/src/MisbehaviorReport.ts
+++ b/packages/types/src/MisbehaviorReport.ts
@@ -21,9 +21,12 @@ type BftAtReportValue = BftAtReportValueSingle & {
   b?: BftHashSignatureValue
 };
 
-// A report of a/b hash-signature pairs for a specific index. This is the same
-// structure as is used in BftDoublePrepare & BftDoubleCommit
-//
+/**
+ * @name BftAtReport
+ * @description
+ * A report of a/b hash-signature pairs for a specific index. This is the same
+ * structure as is used in BftDoublePrepare & BftDoubleCommit
+ */
 // FIXME It is not entirely obvious from the actual Rust code what the specific
 // items in the structure is called, except a & b (one should be expected, the
 // other actual)
@@ -49,6 +52,11 @@ export class BftAtReport extends Struct {
   }
 }
 
+/**
+ * @name BftProposeOutOfTurn
+ * @description
+ * A report for out-of-turn proposals
+ */
 export class BftProposeOutOfTurn extends Struct {
   constructor (value?: BftAtReportValue | Uint8Array) {
     super({
@@ -66,18 +74,35 @@ export class BftProposeOutOfTurn extends Struct {
   }
 }
 
-// Report of a double-propose
+/**
+ * @name BftDoublePropose
+ * @description
+ * Report of a double-propose
+ */
 export class BftDoublePropose extends BftAtReport {
 }
 
-// Report of a double-prepare
+/**
+ * @name BftDoublePrepare
+ * @description
+ * Report of a double-prepare
+ */
 export class BftDoublePrepare extends BftAtReport {
 }
 
-// Report of a double-commit
+/**
+ * @name BftDoubleCommit
+ * @description
+ * Report of a double-commit
+ */
 export class BftDoubleCommit extends BftAtReport {
 }
 
+/**
+ * @name MisbehaviorKind
+ * @description
+ * An [[EnumType]] containing a Bft misbehaviour
+ */
 export class MisbehaviorKind extends EnumType<BftProposeOutOfTurn | BftDoublePropose | BftDoublePrepare | BftDoubleCommit> {
   constructor (value?: BftAtReportValue | Uint8Array, index?: number) {
     super([
@@ -96,7 +121,11 @@ type MisbehaviorReportValue = {
   target?: AuthorityId | string
 };
 
-// A Misbehaviour report against a specific AuthorityId
+/**
+ * @name MisbehaviorReport
+ * @description
+ * A Misbehaviour report of [[MisbehavioirKind]] against a specific [[AuthorityId]]
+ */
 export default class MisbehaviorReport extends Struct {
   constructor (value?: MisbehaviorReportValue | Uint8Array) {
     super({
diff --git a/packages/types/src/Moment.ts b/packages/types/src/Moment.ts
index 899d764abe..bdabfd86a2 100644
--- a/packages/types/src/Moment.ts
+++ b/packages/types/src/Moment.ts
@@ -10,10 +10,14 @@ import { AnyNumber, Codec } from './types';
 
 const BITLENGTH: UIntBitLength = 64;
 
-// A wrapper around seconds/timestamps. Internally the representation only has
-// second precicion (aligning with Rust), so any numbers passed an/out are always
-// per-second. For any encoding/decoding the 1000 multiplier would be applied to
-// get it in line with JavaScript formats
+/**
+ * @name Moment
+ * @description
+ * A wrapper around seconds/timestamps. Internally the representation only has
+ * second precicion (aligning with Rust), so any numbers passed an/out are always
+ *  per-second. For any encoding/decoding the 1000 multiplier would be applied to
+ * get it in line with JavaScript formats
+ */
 export default class Moment extends Date implements Codec {
   public raw: Date; // FIXME Remove this once we convert all types out of Base
 
@@ -39,12 +43,16 @@ export default class Moment extends Date implements Codec {
     );
   }
 
+  get encodedLength (): number {
+    return BITLENGTH / 8;
+  }
+
   bitLength (): UIntBitLength {
     return BITLENGTH;
   }
 
-  get encodedLength (): number {
-    return BITLENGTH / 8;
+  toBn (): BN {
+    return new BN(this.toNumber());
   }
 
   toHex (): string {
@@ -55,15 +63,11 @@ export default class Moment extends Date implements Codec {
     return this.toNumber();
   }
 
-  toU8a (isBare?: boolean): Uint8Array {
-    return bnToU8a(this.toNumber(), BITLENGTH, true);
-  }
-
-  toBn (): BN {
-    return new BN(this.toNumber());
-  }
-
   toNumber (): number {
     return Math.ceil(this.getTime() / 1000);
   }
+
+  toU8a (isBare?: boolean): Uint8Array {
+    return bnToU8a(this.toNumber(), BITLENGTH, true);
+  }
 }
diff --git a/packages/types/src/NewAccountOutcome.ts b/packages/types/src/NewAccountOutcome.ts
index a4661b6de6..2447dc97f0 100644
--- a/packages/types/src/NewAccountOutcome.ts
+++ b/packages/types/src/NewAccountOutcome.ts
@@ -5,7 +5,11 @@
 import Enum from './codec/Enum';
 import U8a from './codec/U8a';
 
-// Enum to track the outcome for creation of an account
+/**
+ * @name NewAccountOutcome
+ * @description
+ * Enum to track the outcome for creation of an [[AccountId]]
+ */
 export default class NewAccountOutcome extends Enum {
   constructor (index?: U8a | Uint8Array | number) {
     super([
diff --git a/packages/types/src/Nonce.ts b/packages/types/src/Nonce.ts
index b3e5dfd757..90e2b68aed 100644
--- a/packages/types/src/Nonce.ts
+++ b/packages/types/src/Nonce.ts
@@ -4,7 +4,12 @@
 
 import U64 from './U64';
 
-// The Nonce or number of transactiosn sent by a specific account. Generally used
-// with extrinsics to determine the order of execution.
+/**
+ * @name Nonce
+ * @description
+ * The Nonce or number of transactions sent by a specific account. Generally used
+ * with extrinsics to determine the order of execution. implemented as a Substrate
+ * [[U64]]
+ */
 export default class Index extends U64 {
 }
diff --git a/packages/types/src/Null.ts b/packages/types/src/Null.ts
index b7bad221bd..a212794695 100644
--- a/packages/types/src/Null.ts
+++ b/packages/types/src/Null.ts
@@ -4,7 +4,11 @@
 
 import { Codec } from './types';
 
-// Implements a type that does not contain anything (apart from `null`)
+/**
+ * @name Null
+ * @description
+ * Implements a type that does not contain anything (apart from `null`)
+ */
 export default class Null implements Codec {
   get encodedLength (): number {
     return 0;
@@ -14,15 +18,25 @@ export default class Null implements Codec {
     return '0x';
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return null;
   }
 
-  toU8a (isBare?: boolean): Uint8Array {
-    return new Uint8Array();
-  }
-
+  /**
+   * @description Returns the string representation of the value
+   */
   toString (): string {
     return '';
   }
+
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
+  toU8a (isBare?: boolean): Uint8Array {
+    return new Uint8Array();
+  }
 }
diff --git a/packages/types/src/Origin.ts b/packages/types/src/Origin.ts
index a6f9101add..fa030d7f17 100644
--- a/packages/types/src/Origin.ts
+++ b/packages/types/src/Origin.ts
@@ -2,7 +2,12 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-// Where Origin occurs, it should be ignored, so it should never actually be constructed
+/**
+ * @name Origin
+ * @description
+ * Where Origin occurs, it should be ignored as an internal-only value, so it should
+ * never actually be constructed
+ */
 export default class Origin {
   constructor () {
     throw new Error('Origin should not be constructed, it is only a placeholder for compatibility');
diff --git a/packages/types/src/ParachainId.ts b/packages/types/src/ParachainId.ts
index 75baba5eac..094f220e66 100644
--- a/packages/types/src/ParachainId.ts
+++ b/packages/types/src/ParachainId.ts
@@ -4,6 +4,10 @@
 
 import U64 from './U64';
 
-// Identifier for a deployed parachain
+/**
+ * @name ParachainId
+ * @description
+ * Identifier for a deployed parachain implemented as a [[U64]]
+ */
 export default class ParachainId extends U64 {
 }
diff --git a/packages/types/src/PendingExtrinsics.ts b/packages/types/src/PendingExtrinsics.ts
index cd6cf20747..6a21818318 100644
--- a/packages/types/src/PendingExtrinsics.ts
+++ b/packages/types/src/PendingExtrinsics.ts
@@ -4,6 +4,10 @@
 
 import Extrinsics from './Extrinsics';
 
-// A list of pending extrinsics
+/**
+ * @name PendingExtrinsics
+ * @description
+ * A list of pending [[Extrinsics]]
+ */
 export default class PendingExtrinsics extends Extrinsics {
 }
diff --git a/packages/types/src/Perbill.ts b/packages/types/src/Perbill.ts
index 386a5a486a..c96e29cf72 100644
--- a/packages/types/src/Perbill.ts
+++ b/packages/types/src/Perbill.ts
@@ -4,8 +4,11 @@
 
 import U32 from './U32';
 
-// Parts per billion (see also Permill)
-//
+/**
+ * @name Perbill
+ * @description
+ * Parts per billion (see also [[Permill]])
+ */
 // TODO We need to think about the toNumber() and toString() here, so we
 // want to multiply by 1_000_000_000 for those purposes?
 export default class Perbill extends U32 {
diff --git a/packages/types/src/Permill.ts b/packages/types/src/Permill.ts
index c17b5be825..f440a4a25b 100644
--- a/packages/types/src/Permill.ts
+++ b/packages/types/src/Permill.ts
@@ -4,8 +4,11 @@
 
 import U32 from './U32';
 
-// Parts per million (See also Perbill)
-//
+/**
+ * @name Permill
+ * @description
+ * Parts per million (See also [[Perbill]])
+ */
 // TODO We need to think about the toNumber() and toString() here, so we
 // want to multiply by 1_000_000 for those purposes?
 export default class Permill extends U32 {
diff --git a/packages/types/src/PropIndex.ts b/packages/types/src/PropIndex.ts
index 58f8811b95..7f9790208a 100644
--- a/packages/types/src/PropIndex.ts
+++ b/packages/types/src/PropIndex.ts
@@ -4,6 +4,11 @@
 
 import U32 from './U32';
 
-// An increasing number that represents a specific public proposal index in the system
+/**
+ * @name PropIndex
+ * @description
+ * An increasing number that represents a specific public proposal index in the
+ * system, implemented as a [[U32]]
+ */
 export default class PropIndex extends U32 {
 }
diff --git a/packages/types/src/Proposal.ts b/packages/types/src/Proposal.ts
index a19fdc5916..ef64ca0bf8 100644
--- a/packages/types/src/Proposal.ts
+++ b/packages/types/src/Proposal.ts
@@ -4,6 +4,10 @@
 
 import Method from './Method';
 
-// A proposal in the system. It just extends a method (Proposal = Call in Rust)
+/**
+ * @name Proposal
+ * @description
+ * A proposal in the system. It just extends [[Method]] (Proposal = Call in Rust)
+ */
 export default class Proposal extends Method {
 }
diff --git a/packages/types/src/ProposalIndex.ts b/packages/types/src/ProposalIndex.ts
index 6c4c01dd30..9e2c59aacf 100644
--- a/packages/types/src/ProposalIndex.ts
+++ b/packages/types/src/ProposalIndex.ts
@@ -4,6 +4,11 @@
 
 import U32 from './U32';
 
-// An increasing number that represents a specific council proposal index in the system
+/**
+ * @name ProposalIndex
+ * @description
+ * An increasing number that represents a specific council proposal index in
+ * the system, implemented as [[U32]]
+ */
 export default class ProposalIndex extends U32 {
 }
diff --git a/packages/types/src/ReferendumIndex.ts b/packages/types/src/ReferendumIndex.ts
index daf41ed4bf..2d4f906387 100644
--- a/packages/types/src/ReferendumIndex.ts
+++ b/packages/types/src/ReferendumIndex.ts
@@ -4,7 +4,11 @@
 
 import U32 from './U32';
 
-// An increasing number that represents a specific referendum in the system. It
-// is unique per chain.
+/**
+ * @name ReferendumIndex
+ * @description
+ * An increasing number that represents a specific referendum in the system. It
+ * is unique per chain. Implemented as [[U32]]
+ */
 export default class ReferendumIndex extends U32 {
 }
diff --git a/packages/types/src/RuntimeVersion.ts b/packages/types/src/RuntimeVersion.ts
index 853757dcdf..bda2fa8c72 100644
--- a/packages/types/src/RuntimeVersion.ts
+++ b/packages/types/src/RuntimeVersion.ts
@@ -11,7 +11,12 @@ import Vector from './codec/Vector';
 import Text from './Text';
 import U32 from './U32';
 
-class ApiId extends U8aFixed {
+/**
+ * @name ApiId
+ * @description
+ * An identifier for the runtime API
+ */
+export class ApiId extends U8aFixed {
   constructor (value?: AnyU8a) {
     super(value, 64);
   }
@@ -22,7 +27,12 @@ type RuntimeVersionApiValue = {
   version?: AnyNumber
 };
 
-class RuntimeVersionApi extends Tuple {
+/**
+ * @name RuntimeVersionApi
+ * @description
+ * A [[Tuple]] that conatins the [[ApiId]] and [[U32]] version
+ */
+export class RuntimeVersionApi extends Tuple {
   constructor (value?: RuntimeVersionApiValue | Uint8Array) {
     super({
       id: ApiId,
@@ -48,6 +58,11 @@ type RuntimeVersionValue = {
   apis?: Array<RuntimeVersionApiValue>
 };
 
+/**
+ * @name RuntimeVersion
+ * @description
+ * A defintion of the runtime and the associated versions thereof
+ */
 export default class RuntimeVersion extends Struct {
   constructor (value?: RuntimeVersionValue | Uint8Array) {
     super({
diff --git a/packages/types/src/SessionKey.ts b/packages/types/src/SessionKey.ts
index d3e1f4a1be..f1204193af 100644
--- a/packages/types/src/SessionKey.ts
+++ b/packages/types/src/SessionKey.ts
@@ -4,7 +4,11 @@
 
 import AuthorityId from './AuthorityId';
 
-// Wrapper for a SessionKey. Same as an normal AuthorityId, i.e. a wrapper
-// around publicKey.
+/**
+ * @name SessionKey
+ * @description
+ * Wrapper for a SessionKey. Same as an normal [[AuthorityId]], i.e. a wrapper
+ * around publicKey.
+ */
 export default class SessionKey extends AuthorityId {
 }
diff --git a/packages/types/src/Signature.ts b/packages/types/src/Signature.ts
index 57785b4aa7..a3f5e3f426 100644
--- a/packages/types/src/Signature.ts
+++ b/packages/types/src/Signature.ts
@@ -4,7 +4,11 @@
 
 import H512 from './H512';
 
-// The default signature that is used accross the system. It is currectly defined
-// as a 512-bit value, represented by a hash.
+/**
+ * @name Signature
+ * @description
+ * The default signature that is used accross the system. It is currectly defined
+ * as a 512-bit value, represented by a [[H512]].
+ */
 export default class Signature extends H512 {
 }
diff --git a/packages/types/src/SignaturePayload.ts b/packages/types/src/SignaturePayload.ts
index 9f78560070..a05ce1a98d 100644
--- a/packages/types/src/SignaturePayload.ts
+++ b/packages/types/src/SignaturePayload.ts
@@ -18,11 +18,17 @@ type SignaturePayloadValue = {
   blockHash?: AnyU8a
 };
 
-// Signing Payload.
-//   8 bytes: The Transaction Index/Nonce as provided in the transaction itself.
-//   2+ bytes: The Function Descriptor as provided in the transaction itself.
-//   2 bytes: The Transaction Era as provided in the transaction itself.
-//   32 bytes: The hash of the authoring block implied by the Transaction Era and the current block.
+/**
+ * @name SignaturePayload
+ * @description
+ * A signing payload for an [[Extrinsic]]. For the final encoding, it is variable length based
+ * on the conetnts included
+ *
+ *   8 bytes: The Transaction Index/Nonce as provided in the transaction itself.
+ *   2+ bytes: The Function Descriptor as provided in the transaction itself.
+ *   2 bytes: The Transaction Era as provided in the transaction itself.
+ *   32 bytes: The hash of the authoring block implied by the Transaction Era and the current block.
+ */
 export default class SignaturePayload extends Struct {
   protected _signature?: Uint8Array;
 
diff --git a/packages/types/src/SignedBlock.ts b/packages/types/src/SignedBlock.ts
index 7d67069bd8..d7a61aa6bd 100644
--- a/packages/types/src/SignedBlock.ts
+++ b/packages/types/src/SignedBlock.ts
@@ -13,6 +13,11 @@ type SignedBlockValue = {
   justification?: AnyU8a
 };
 
+/**
+ * @name SignedBlock
+ * @description
+ * A [[Block]] that has been signed and contains a [[Justification]]
+ */
 export default class SignedBlock extends Struct {
   constructor (value?: SignedBlockValue | Uint8Array) {
     super({
diff --git a/packages/types/src/StorageChangeSet.ts b/packages/types/src/StorageChangeSet.ts
index 59796507c9..9d6add6bbc 100644
--- a/packages/types/src/StorageChangeSet.ts
+++ b/packages/types/src/StorageChangeSet.ts
@@ -14,8 +14,13 @@ type StorageChangeSetValue = {
   changes?: Array<KeyValueOptionValue>
 };
 
-// A set of storage changes. It contains the hash/block and
-// a list of the actual changes that took place
+/**
+ * @name StorageChangeSet
+ * @description
+ * A set of storage changes. It contains the [[Block]] hash and
+ * a list of the actual changes that took place as an array of
+ * [[KeyValueOption]]
+ */
 export default class StorageChangeSet extends Struct {
   constructor (value?: StorageChangeSetValue | Uint8Array) {
     super({
diff --git a/packages/types/src/StorageData.ts b/packages/types/src/StorageData.ts
index 39a18b6f0b..b9ecc6086a 100644
--- a/packages/types/src/StorageData.ts
+++ b/packages/types/src/StorageData.ts
@@ -4,6 +4,10 @@
 
 import Bytes from './Bytes';
 
-// Data retrieve via Storage queries and data for KeyValue pairs
+/**
+ * @name StorageData
+ * @description
+ * Data retrieved via Storage queries and data for KeyValue pairs
+ */
 export default class StorageData extends Bytes {
 }
diff --git a/packages/types/src/StorageKey.ts b/packages/types/src/StorageKey.ts
index cc5fe9d6a4..a26a9b10a2 100644
--- a/packages/types/src/StorageKey.ts
+++ b/packages/types/src/StorageKey.ts
@@ -17,8 +17,12 @@ export interface StorageFunction {
   toJSON: () => any;
 }
 
-// A representation of a storage key (typically hashed) in the system. It can be constructed
-// by passing in a raw key or a StorageFunction with (optional) arguments.
+/**
+ * @name StorageKey
+ * @description
+ * A representation of a storage key (typically hashed) in the system. It can be
+ * constructed by passing in a raw key or a StorageFunction with (optional) arguments.
+ */
 export default class StorageKey extends Bytes {
   private _outputType: string | null;
 
diff --git a/packages/types/src/StoredPendingChange.ts b/packages/types/src/StoredPendingChange.ts
index 2600e4de47..76c3087938 100644
--- a/packages/types/src/StoredPendingChange.ts
+++ b/packages/types/src/StoredPendingChange.ts
@@ -23,7 +23,12 @@ export type StoredPendingChangeValue = {
   nextAuthorities?: Array<Uint8Array | NextAuthorityValue>
 };
 
-class NextAuthority extends Tuple {
+/**
+ * @name NextAuthority
+ * @description
+ * The next authority available as [[SessionKey]]
+ */
+export class NextAuthority extends Tuple {
   constructor (value?: Uint8Array | NextAuthorityValue) {
     super({
       sessionKey: SessionKey,
@@ -40,7 +45,11 @@ class NextAuthority extends Tuple {
   }
 }
 
-// Stored pending change for a Grandpa events
+/**
+ * @name StoredPendingChange
+ * @description
+ * Stored pending change for a Grandpa events
+ */
 export default class StoredPendingChange extends Struct {
   constructor (value?: Uint8Array | StoredPendingChangeValue) {
     super({
diff --git a/packages/types/src/Text.ts b/packages/types/src/Text.ts
index 5021f0af7f..c2114ff3a6 100644
--- a/packages/types/src/Text.ts
+++ b/packages/types/src/Text.ts
@@ -7,9 +7,12 @@ import { isFunction, isString, stringToU8a, u8aToString, u8aToHex } from '@polka
 import { AnyU8a, Codec } from './types';
 import Compact from './codec/Compact';
 
-// This is a string wrapper, along with the length. It is used both for strings as well
-// as stuff like documentation.
-//
+/**
+ * @name Text
+ * @description
+ * This is a string wrapper, along with the length. It is used both for strings as well
+ * as items such as documentation.
+ */
 // TODO
 //   - Strings should probably be trimmed (docs do come through with extra padding)
 //   - Potentially we want a "TypeString" extension to this. Basically something that
diff --git a/packages/types/src/Type.ts b/packages/types/src/Type.ts
index 5519229fad..5fb389b930 100644
--- a/packages/types/src/Type.ts
+++ b/packages/types/src/Type.ts
@@ -9,9 +9,13 @@ type Mapper = (value: string) => string;
 
 const ALLOWED_BOXES = ['Compact', 'Option', 'Vec'];
 
-// This is a extended version of String, specifically to handle types. Here we rely full on
-// what string provides us, however we also "tweak" the types received from the runtime, i.e.
-// we remove the `T::` prefixes found in some types for consistency accross implementation.
+/**
+ * @name Type
+ * @description
+ * This is a extended version of String, specifically to handle types. Here we rely fully
+ * on what string provides us, however we also adjust the types received from the runtime,
+ * i.e. we remove the `T::` prefixes found in some types for consistency accross implementation.
+ */
 export default class Type extends Text {
   private _originalLength: number;
 
@@ -57,17 +61,17 @@ export default class Type extends Text {
     }, value).trim();
   }
 
-  // NOTE Length is used in the decoding calculations, so return the original (pre-cleanup)
-  // length of the data. Since toU8a is disabled, this does not affect encoding, but rather
-  // only the decoding leg, allowing the decoders to work with original pointers
   get encodedLength (): number {
+    // NOTE Length is used in the decoding calculations, so return the original (pre-cleanup)
+    // length of the data. Since toU8a is disabled, this does not affect encoding, but rather
+    // only the decoding leg, allowing the decoders to work with original pointers
     return this._originalLength + Compact.encodeU8a(this._originalLength).length;
   }
 
-  // Note Since we are mangling what we get in beyond recognition, we really should
-  // not allow the re-encoding. Additionally, this is probably more of a decoder-only
-  // helper, so treat it as such.
   toU8a (isBare?: boolean): Uint8Array {
+    // Note Since we are mangling what we get in beyond recognition, we really should
+    // not allow the re-encoding. Additionally, this is probably more of a decoder-only
+    // helper, so treat it as such.
     throw new Error('Type::toU8a: unimplemented');
   }
 
diff --git a/packages/types/src/U128.ts b/packages/types/src/U128.ts
index 5de6d7345d..0a92b5c972 100644
--- a/packages/types/src/U128.ts
+++ b/packages/types/src/U128.ts
@@ -6,6 +6,11 @@ import { AnyNumber } from './types';
 
 import UInt from './codec/UInt';
 
+/**
+ * @name U128
+ * @description
+ * An 128-bit number
+ */
 export default class U128 extends UInt {
   constructor (value?: AnyNumber) {
     super(value, 128);
diff --git a/packages/types/src/U16.ts b/packages/types/src/U16.ts
index 04856ee04f..c2fc552f00 100644
--- a/packages/types/src/U16.ts
+++ b/packages/types/src/U16.ts
@@ -6,6 +6,11 @@ import { AnyNumber } from './types';
 
 import UInt from './codec/UInt';
 
+/**
+ * @name U16
+ * @description
+ * An 16-bit number
+ */
 export default class U16 extends UInt {
   constructor (value?: AnyNumber) {
     super(value, 16, false);
diff --git a/packages/types/src/U256.ts b/packages/types/src/U256.ts
index 92cbacfb17..a99de41fbd 100644
--- a/packages/types/src/U256.ts
+++ b/packages/types/src/U256.ts
@@ -6,6 +6,11 @@ import { AnyNumber } from './types';
 
 import UInt from './codec/UInt';
 
+/**
+ * @name U256
+ * @description
+ * An 256-bit number
+ */
 export default class U256 extends UInt {
   constructor (value?: AnyNumber) {
     super(value, 256);
diff --git a/packages/types/src/U32.ts b/packages/types/src/U32.ts
index 487ad68d72..398206881a 100644
--- a/packages/types/src/U32.ts
+++ b/packages/types/src/U32.ts
@@ -6,6 +6,11 @@ import { AnyNumber } from './types';
 
 import UInt from './codec/UInt';
 
+/**
+ * @name U32
+ * @description
+ * An 32-bit number
+ */
 export default class U32 extends UInt {
   constructor (value?: AnyNumber) {
     super(value, 32, false);
diff --git a/packages/types/src/U64.ts b/packages/types/src/U64.ts
index b282bd909c..089296160e 100644
--- a/packages/types/src/U64.ts
+++ b/packages/types/src/U64.ts
@@ -6,6 +6,11 @@ import { AnyNumber } from './types';
 
 import UInt from './codec/UInt';
 
+/**
+ * @name U64
+ * @description
+ * An 64-bit number
+ */
 export default class U64 extends UInt {
   constructor (value?: AnyNumber) {
     super(value, 64, false);
diff --git a/packages/types/src/U8.ts b/packages/types/src/U8.ts
index cc24301ba4..c37db94a9d 100644
--- a/packages/types/src/U8.ts
+++ b/packages/types/src/U8.ts
@@ -6,6 +6,11 @@ import { AnyNumber } from './types';
 
 import UInt from './codec/UInt';
 
+/**
+ * @name U8
+ * @description
+ * An 8-bit number
+ */
 export default class U8 extends UInt {
   constructor (value?: AnyNumber) {
     super(value, 8, false);
diff --git a/packages/types/src/ValidatorPrefs.ts b/packages/types/src/ValidatorPrefs.ts
index e93edc42da..c3118b03fa 100644
--- a/packages/types/src/ValidatorPrefs.ts
+++ b/packages/types/src/ValidatorPrefs.ts
@@ -13,6 +13,11 @@ type ValidatorPrefsValue = {
   validatorPayment?: AnyNumber
 };
 
+/**
+ * @name ValidatorPrefs
+ * @description
+ * Validator preferences
+ */
 export default class ValidatorPrefs extends Struct {
   constructor (value?: ValidatorPrefsValue | Uint8Array) {
     super({
diff --git a/packages/types/src/VoteIndex.ts b/packages/types/src/VoteIndex.ts
index f2dc241255..a030801237 100644
--- a/packages/types/src/VoteIndex.ts
+++ b/packages/types/src/VoteIndex.ts
@@ -4,5 +4,10 @@
 
 import U32 from './U32';
 
+/**
+ * @name VoteIndex
+ * @description
+ * Voting index, implemented as a [[U32]]
+ */
 export default class VoteIndex extends U32 {
 }
diff --git a/packages/types/src/VoteThreshold.ts b/packages/types/src/VoteThreshold.ts
index 4b2c6d2eb8..455f390b1a 100644
--- a/packages/types/src/VoteThreshold.ts
+++ b/packages/types/src/VoteThreshold.ts
@@ -4,7 +4,11 @@
 
 import Enum from './codec/Enum';
 
-// Voting threshold, used inside proposals to set change the voting tally
+/**
+ * @name VoteThreshold
+ * @description
+ * Voting threshold, used inside proposals to set change the voting tally
+ */
 export default class VoteThreshold extends Enum {
   constructor (index?: number | Uint8Array) {
     super([
diff --git a/packages/types/src/codec/Base.ts b/packages/types/src/codec/Base.ts
index 6a587ad418..4d9144914b 100644
--- a/packages/types/src/codec/Base.ts
+++ b/packages/types/src/codec/Base.ts
@@ -3,7 +3,8 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 /**
- * A type extends the Base class, when it holds a value
+ * @name Base
+ * @description A type extends the Base class, when it holds a value
  */
 export default class Base<T = any> {
   protected raw: T;
diff --git a/packages/types/src/codec/Compact.ts b/packages/types/src/codec/Compact.ts
index 898928a779..a2e46d6691 100644
--- a/packages/types/src/codec/Compact.ts
+++ b/packages/types/src/codec/Compact.ts
@@ -11,21 +11,14 @@ import Base from './Base';
 import UInt, { UIntBitLength } from './UInt';
 import Moment from '../Moment';
 
-// A new compact length-encoding algorithm. It performs the same function as Length, however
-// differs in that it uses a variable number of bytes to do the actual encoding. From the Rust
-// implementation for compact encoding
-//
-//     0b00 00 00 00 / 00 00 00 00 / 00 00 00 00 / 00 00 00 00
-// (0 ... 2**6 - 1)    (u8)
-//     xx xx xx 00
-// (2**6 ... 2**14 - 1)  (u8, u16)  low LH high
-//     yL yL yL 01 / yH yH yH yL
-// (2**14 ... 2**30 - 1)  (u16, u32)  low LMMH high
-//     zL zL zL 10 / zM zM zM zL / zM zM zM zM / zH zH zH zM
-// (2**30 ... 2**536 - 1)  (u32, u64, u128, U256, U512, U520) straight LE-encoded
-//     nn nn nn 11 [ / zz zz zz zz ]{4 + n}
-//
-// Note: we use *LOW BITS* of the LSB in LE encoding to encode the 2 bit key.
+/**
+ * @name Compact
+ * @description
+ * A compact length-encoding codec wrapper. It performs the same function as Length, however
+ * differs in that it uses a variable number of bytes to do the actual encoding. This is mostly
+ * used by other types to add length-prefixed encoding, or in the case of wrapped types, taking
+ * a number and making the compact representation thereof
+ */
 export default class Compact extends Base<UInt | Moment> implements Codec {
   constructor (Type: Constructor<UInt | Moment>, value: AnyNumber = 0) {
     super(Compact.decodeCompact(Type, value));
@@ -72,34 +65,59 @@ export default class Compact extends Base<UInt | Moment> implements Codec {
     return new Type(value.toBn());
   }
 
-  bitLength (): UIntBitLength {
-    return this.raw.bitLength();
-  }
-
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return this.toU8a().length;
   }
 
+  /**
+   * @description Returns the number of bits in the value
+   */
+  bitLength (): UIntBitLength {
+    return this.raw.bitLength();
+  }
+
+  /**
+   * @description Returns the BN representation of the number
+   */
   toBn (): BN {
     return this.raw.toBn();
   }
 
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): any {
     return this.raw.toHex();
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this.raw.toJSON();
   }
 
+  /**
+   * @description Returns the number representation for the value
+   */
   toNumber (): number {
     return this.raw.toNumber();
   }
 
+  /**
+   * @description Returns the string representation of the value
+   */
   toString (): string {
     return this.raw.toString();
   }
 
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     return Compact.encodeU8a(this.raw.toBn(), this.bitLength());
   }
diff --git a/packages/types/src/codec/Enum.ts b/packages/types/src/codec/Enum.ts
index dc5d379667..5c00f33440 100644
--- a/packages/types/src/codec/Enum.ts
+++ b/packages/types/src/codec/Enum.ts
@@ -11,11 +11,14 @@ type EnumDef = {
   [index: number]: string
 } | Array<string>;
 
-// A codec wrapper for an enum. Enums are encoded as a single byte, where the byte
-// is a zero-indexed value. This class allows you to retrieve the value either
-// by `toNumber()` exposing the actual raw index, or `toString()` returning a
-// string representation (as provided as part of the constructor)
-//
+/**
+ * @name Enum
+ * @description
+ * A codec wrapper for an enum. Enums are encoded as a single byte, where the byte
+ * is a zero-indexed value. This class allows you to retrieve the value either
+ * by `toNumber()` exposing the actual raw index, or `toString()` returning a
+ * string representation (as provided as part of the constructor)
+ */
 // TODO:
 //   - It would be great if this could actually wrap actual TS enums
 export default class Enum extends Base<number> implements Codec {
@@ -39,26 +42,45 @@ export default class Enum extends Base<number> implements Codec {
     }
   }
 
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return 1;
   }
 
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string {
     return u8aToHex(this.toU8a());
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this.raw;
   }
 
+  /**
+   * @description Returns the number representation for the value
+   */
   toNumber (): number {
     return this.raw;
   }
 
+  /**
+   * @description Returns the string representation of the value
+   */
   toString (): string {
     return this._enum[this.raw] || `${this.raw}`;
   }
 
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     return new Uint8Array([this.raw]);
   }
diff --git a/packages/types/src/codec/EnumType.ts b/packages/types/src/codec/EnumType.ts
index 595adc990f..01100f8cf2 100644
--- a/packages/types/src/codec/EnumType.ts
+++ b/packages/types/src/codec/EnumType.ts
@@ -13,9 +13,12 @@ type TypesDef = {
   [index: number]: Constructor
 } | TypesArray;
 
-// This implements an enum, that based on the value wraps a different type. It is effectively an
-// extension to enum where the value type is determined by the actual index.
-//
+/**
+ * @name EnumType
+ * @description
+ * This implements an enum, that based on the value wraps a different type. It is effectively
+ * an extension to enum where the value type is determined by the actual index.
+ */
 // TODO:
 //   - As per Enum, actually use TS enum
 //   - It should rather probably extend Enum instead of copying code
@@ -78,38 +81,73 @@ export default class EnumType<T> extends Base<Codec> implements Codec {
     return { index: 0, value: new (Object.values(def)[0])() };
   }
 
-  get isNull (): boolean {
-    return this.raw instanceof Null;
-  }
-
-  get type (): string {
-    return this._Types[this._index].name;
-  }
-
-  get value (): Codec {
-    return this.raw;
-  }
-
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return 1 + this.raw.encodedLength;
   }
 
+  /**
+   * @description Checks if the Enum points to a [[Null]] type
+   */
+  get isNone (): boolean {
+    return this.raw instanceof Null;
+  }
+
+  /**
+   * @description Checks if the Enum points to a [[Null]] type (deprecated, use isNone)
+   */
+  get isNull (): boolean {
+    return this.raw instanceof Null;
+  }
+
+  /**
+   * @description The name of the type this enum value represents
+   */
+  get type (): string {
+    return this._Types[this._index].name;
+  }
+
+  /**
+   * @description The value of the enum
+   */
+  get value (): Codec {
+    return this.raw;
+  }
+
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string {
     return u8aToHex(this.toU8a());
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this.raw;
   }
 
+  /**
+   * @description Returns the number representation for the value
+   */
   toNumber (): number {
     return this._index;
   }
 
+  /**
+   * @description Returns the string representation of the value
+   */
   toString (): string {
     return this.type;
   }
 
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     const index = this._indexes[this._index];
 
diff --git a/packages/types/src/codec/Option.ts b/packages/types/src/codec/Option.ts
index 3a5e4815c2..655d3058d7 100644
--- a/packages/types/src/codec/Option.ts
+++ b/packages/types/src/codec/Option.ts
@@ -8,10 +8,14 @@ import Base from './Base';
 import { Codec, Constructor } from '../types';
 import Null from '../Null';
 
-// An Option is an optional field. Basically the first byte indicates that there is
-// is value to follow. If the byte is `1` there is an actual value. So the Option
-// implements that - decodes, checks for optionality and wraps the required structure
-// with a value if/as required/found.
+/**
+ * @name Option
+ * @description
+ * An Option is an optional field. Basically the first byte indicates that there is
+ * is value to follow. If the byte is `1` there is an actual value. So the Option
+ * implements that - decodes, checks for optionality and wraps the required structure
+ * with a value if/as required/found.
+ */
 export default class Option<T extends Codec> extends Base<T> implements Codec {
   constructor (Type: Constructor, value?: any) {
     super(
@@ -42,30 +46,60 @@ export default class Option<T extends Codec> extends Base<T> implements Codec {
     };
   }
 
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
+  get encodedLength (): number {
+    // boolean byte (has value, doesn't have) along with wrapped length
+    return 1 + this.raw.encodedLength;
+  }
+
+  /**
+   * @description Checks if the Option has no value
+   */
   get isNone (): boolean {
     return this.raw instanceof Null;
   }
 
+  /**
+   * @description Checks if the Option has a value
+   */
   get isSome (): boolean {
     return !this.isNone;
   }
 
+  /**
+   * @description The actual value for the Option
+   */
   get value (): Codec {
     return this.raw;
   }
 
-  get encodedLength (): number {
-    return 1 + this.raw.encodedLength;
-  }
-
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string {
     return u8aToHex(this.toU8a());
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this.raw.toJSON();
   }
 
+  /**
+   * @description Returns the string representation of the value
+   */
+  toString (): string {
+    return this.raw.toString();
+  }
+
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     if (isBare) {
       return this.raw.toU8a(true);
@@ -81,14 +115,14 @@ export default class Option<T extends Codec> extends Base<T> implements Codec {
     return u8a;
   }
 
-  toString (): string {
-    return this.raw.toString();
-  }
-
+  /**
+   * @description Returns the value that the Option represents (if available)
+   */
   unwrap (): T {
     if (this.isNone) {
       throw new Error('Option: unwrapping a None value');
     }
+
     return this.raw;
   }
 }
diff --git a/packages/types/src/codec/Set.ts b/packages/types/src/codec/Set.ts
index 63a879a593..52e9c60715 100644
--- a/packages/types/src/codec/Set.ts
+++ b/packages/types/src/codec/Set.ts
@@ -11,10 +11,13 @@ type SetValues = {
   [index: string]: number
 };
 
-// An Set is an array of string values, represented an an encoded type by
-// a bitwise representation of the values.
-//
-// FIXME This is a prime candidate to potentially extend Set
+/**
+ * @name Set
+ * @description
+ * An Set is an array of string values, represented an an encoded type by
+ * a bitwise representation of the values.
+ */
+// FIXME This is a prime candidate to extend the JavaScript built-in Set
 export default class Set extends Base<Array<string>> implements Codec {
   private _setValues: SetValues;
 
@@ -63,35 +66,60 @@ export default class Set extends Base<Array<string>> implements Codec {
     }, 0);
   }
 
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return 1;
   }
 
+  /**
+   * @description true is the Set contains no values
+   */
   get isEmpty (): boolean {
     return this.values.length === 0;
   }
 
+  /**
+   * @description The actual set values as a Array<string>
+   */
   get values (): Array<string> {
     return this.raw;
   }
 
+  /**
+   * @description The encoded value for the set members
+   */
   get valueEncoded (): number {
     return Set.encodeSet(this._setValues, this.raw);
   }
 
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string {
     return u8aToHex(this.toU8a());
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this.values;
   }
 
+  /**
+   * @description Returns the string representation of the value
+   */
+  toString (): string {
+    return `[${this.values.join(', ')}]`;
+  }
+
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     return new Uint8Array(this.valueEncoded);
   }
-
-  toString (): string {
-    return `[${this.values.map((value) => value).join(', ')}]`;
-  }
 }
diff --git a/packages/types/src/codec/Struct.ts b/packages/types/src/codec/Struct.ts
index 8886b0c3cd..bc2a2f89b9 100644
--- a/packages/types/src/codec/Struct.ts
+++ b/packages/types/src/codec/Struct.ts
@@ -6,11 +6,15 @@ import { hexToU8a, isHex, isObject, isU8a, u8aConcat, u8aToHex } from '@polkadot
 
 import { Codec, Constructor, ConstructorDef } from '../types';
 
-// A Struct defines an Object with key/values - where the values are Codec values. It removes
-// a lot of repetition from the actual coding, define a structure type, pass it the key/Codec
-// values in the constructor and it manages the decoding. It is important that the constructor
-// values matches 100% to the order in th Rust code, i.e. don't go crazy and make it alphabetical,
-// it needs to decoded in the specific defined order.
+/**
+ * @name Struct
+ * @description
+ * A Struct defines an Object with key/values - where the values are Codec values. It removes
+ * a lot of repetition from the actual coding, define a structure type, pass it the key/Codec
+ * values in the constructor and it manages the decoding. It is important that the constructor
+ * values matches 100% to the order in th Rust code, i.e. don't go crazy and make it alphabetical,
+ * it needs to decoded in the specific defined order.
+ */
 export default class Struct<
   // The actual Class structure, i.e. key -> Class
   S extends ConstructorDef = ConstructorDef,
@@ -126,24 +130,39 @@ export default class Struct<
     return this._Types;
   }
 
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return this.toArray().reduce((length, entry) => {
       return length += entry.encodedLength;
     }, 0);
   }
 
+  /**
+   * @description Returns the values of a member at a specific index (Rather use get(name) for performance)
+   */
   getAtIndex (index: number): Codec {
     return this.toArray()[index];
   }
 
+  /**
+   * @description Converts the Object to an standard JavaScript Array
+   */
   toArray (): Array<Codec> {
     return [...this.values()];
   }
 
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex () {
     return u8aToHex(this.toU8a());
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return [...this.keys()].reduce((json, key) => {
       const jsonKey = this._jsonMap.get(key) || key;
@@ -155,10 +174,17 @@ export default class Struct<
     }, {} as any);
   }
 
+  /**
+   * @description Returns the string representation of the value
+   */
   toString () {
     return JSON.stringify(this.toJSON());
   }
 
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     return u8aConcat(
       ...this.toArray().map((entry) =>
diff --git a/packages/types/src/codec/Tuple.ts b/packages/types/src/codec/Tuple.ts
index ef7c61bae1..0258fb56b7 100644
--- a/packages/types/src/codec/Tuple.ts
+++ b/packages/types/src/codec/Tuple.ts
@@ -5,9 +5,13 @@
 import { Codec, Constructor, ConstructorDef } from '../types';
 import Struct from './Struct';
 
-// A Tuple defines an anonymous Object with key/values - where the values are Codec values. It
-// is a specialization of the Struct type where the toJSON operates on Array structures,
-// while the U8a encoding is handled in the same way as a Struct
+/**
+ * @name Tuple
+ * @description
+ * A Tuple defines an anonymous Object with key/values - where the values are Codec values.
+ * It is a specialization of the Struct type where the toJSON operates on Array structures,
+ * while the U8a encoding is handled in the same way as a Struct
+ */
 export default class Tuple<
   // S & T definitions maps to what we have in Struct (naming documented there)
   S extends ConstructorDef = { [index: string]: Constructor<Codec> },
@@ -24,6 +28,9 @@ export default class Tuple<
     };
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return [...this.values()].map((entry) =>
       entry.toJSON()
diff --git a/packages/types/src/codec/U8a.ts b/packages/types/src/codec/U8a.ts
index 5710ebb276..5b4ea0a01b 100644
--- a/packages/types/src/codec/U8a.ts
+++ b/packages/types/src/codec/U8a.ts
@@ -6,10 +6,14 @@ import { isU8a, u8aToHex, u8aToU8a } from '@polkadot/util';
 
 import { AnyU8a, Codec } from '../types';
 
-// A U8a. A basic wrapper around Uint8Array, with no frills and no fuss. It
-// wraps a Uint8Array. It does differ from other implementations wher it will
-// consume the full u8a as passed to it in U8a. As such it is meant to be
-// subclassed where the wrapper takes care of the actual lengths.
+/**
+ * @name U8a
+ * @description
+ * A basic wrapper around Uint8Array, with no frills and no fuss. It does differ
+ * from other implementations wher it will consume the full Uint8Array as passed to
+ * it. As such it is meant to be subclassed where the wrapper takes care of the
+ * actual lengths instead of used directly.
+ */
 export default class U8a extends Uint8Array implements Codec {
   constructor (value: AnyU8a) {
     super(
@@ -25,6 +29,9 @@ export default class U8a extends Uint8Array implements Codec {
     }
   }
 
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return this.length;
   }
@@ -35,19 +42,32 @@ export default class U8a extends Uint8Array implements Codec {
     return Uint8Array.from(this).subarray(begin, end);
   }
 
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string {
     return u8aToHex(this);
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this.toHex();
   }
 
-  toU8a (isBare?: boolean): Uint8Array {
-    return Uint8Array.from(this);
-  }
-
+  /**
+   * @description Returns the string representation of the value
+   */
   toString (): string {
     return this.toHex();
   }
+
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
+  toU8a (isBare?: boolean): Uint8Array {
+    return Uint8Array.from(this);
+  }
 }
diff --git a/packages/types/src/codec/U8aFixed.ts b/packages/types/src/codec/U8aFixed.ts
index f0af4da97a..62d387bacb 100644
--- a/packages/types/src/codec/U8aFixed.ts
+++ b/packages/types/src/codec/U8aFixed.ts
@@ -10,8 +10,12 @@ import U8a from './U8a';
 
 type BitLength = 8 | 16 | 32 | 64 | 128 | 256 | 512;
 
-// A U8a that manages a a sequence of bytes up to the specified bitLength. Not meant
-// to be used directly, rather is should be subclassed with the specific lengths.
+/**
+ * @name U8aFixed
+ * @description
+ * A U8a that manages a a sequence of bytes up to the specified bitLength. Not meant
+ * to be used directly, rather is should be subclassed with the specific lengths.
+ */
 export default class U8aFixed extends U8a {
   constructor (value: AnyU8a = new Uint8Array(), bitLength: BitLength = 256) {
     super(
@@ -29,6 +33,9 @@ export default class U8aFixed extends U8a {
     return value;
   }
 
+  /**
+   * @description Returns the number of bits in the value
+   */
   bitLength () {
     return this.length * 8;
   }
diff --git a/packages/types/src/codec/UInt.ts b/packages/types/src/codec/UInt.ts
index 9f3c83fb25..3ad4a1d0d6 100644
--- a/packages/types/src/codec/UInt.ts
+++ b/packages/types/src/codec/UInt.ts
@@ -11,12 +11,15 @@ export type UIntBitLength = 8 | 16 | 32 | 64 | 128 | 256;
 
 export const DEFAULT_UINT_BITS = 64;
 
-// A generic number codec. For Substrate all numbers are LE encoded, this handles the encoding
-// and decoding of those numbers. Upon construction the bitLength is provided and any additional
-// use keeps the number to this length.
-//
+/**
+ * @name UInt
+ * @description
+ * A generic number codec. For Substrate all numbers are LE encoded, this handles the encoding
+ * and decoding of those numbers. Upon construction the bitLength is provided and any additional
+ * use keeps the number to this length.
+ */
 // TODO:
-//   - Apart from encoding/decoding we don't actuall keep check on the sizes, is this good enough?
+//   - Apart from encoding/decoding we don't actually keep check on the sizes, is this good enough?
 export default class UInt extends BN implements Codec {
   protected _bitLength: UIntBitLength;
   private _isHexJson: boolean;
@@ -46,29 +49,48 @@ export default class UInt extends BN implements Codec {
     return bnToBn(value).toString();
   }
 
-  bitLength (): UIntBitLength {
-    return this._bitLength;
-  }
-
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return this._bitLength / 8;
   }
 
+  /**
+   * @description Returns the number of bits in the value
+   */
+  bitLength (): UIntBitLength {
+    return this._bitLength;
+  }
+
+  /**
+   * @description Returns the BN representation of the number. (Compatibility)
+   */
+  toBn (): BN {
+    return this;
+  }
+
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string {
     return bnToHex(this, this._bitLength);
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this._isHexJson
       ? this.toHex()
       : this.toNumber();
   }
 
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     return bnToU8a(this, this._bitLength, true);
   }
-
-  toBn (): BN {
-    return this;
-  }
 }
diff --git a/packages/types/src/codec/Vector.ts b/packages/types/src/codec/Vector.ts
index 9acf82f472..a25136b9e3 100644
--- a/packages/types/src/codec/Vector.ts
+++ b/packages/types/src/codec/Vector.ts
@@ -7,11 +7,13 @@ import { u8aConcat, u8aToU8a, u8aToHex } from '@polkadot/util';
 import Compact from './Compact';
 import { Codec, Constructor } from '../types';
 
-// This manages codec arrays. Intrernally it keeps track of the length (as decoded) and allows
-// construction with the passed `Type` in the constructor. It aims to be an array-like structure,
-// i.e. while it wraps an array, it provides a `length` property to get the actual length, `at(index)`
-// to retrieve a specific item. Additionally the helper functions `map`, `filter`, `forEach` and
-// `reduce` is exposed on the interface.
+/**
+ * @name Vector
+ * @description
+ * This manages codec arrays. Intrernally it keeps track of the length (as decoded) and allows
+ * construction with the passed `Type` in the constructor. It is an extension to Array, providing
+ * specific encoding/decoding on top of the base type.
+ */
 export default class Vector<
   T extends Codec
   > extends Array<T> implements Codec {
@@ -63,26 +65,41 @@ export default class Vector<
     return this._Type.name;
   }
 
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   get encodedLength (): number {
     return this.reduce((total, raw) => {
       return total + raw.encodedLength;
     }, Compact.encodeU8a(this.length).length);
   }
 
+  /**
+   * @description Converts the Object to an standard JavaScript Array
+   */
   toArray (): Array<T> {
     return Array.from(this);
   }
 
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string {
     return u8aToHex(this.toU8a());
   }
 
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any {
     return this.map((entry) =>
       entry.toJSON()
     );
   }
 
+  /**
+   * @description Returns the string representation of the value
+   */
   toString (): string {
     // Overwrite the default toString representation of Array.
     const data = this.map((entry) =>
@@ -92,6 +109,10 @@ export default class Vector<
     return `[${data.join(', ')}]`;
   }
 
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array {
     const encoded = this.map((entry) =>
       entry.toU8a(isBare)
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index f599555887..92cdfa6adc 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -7,6 +7,9 @@
 // perspective these are the value classes. (Codec is for the cases where you need
 // to construct values dynamically)
 
+/**
+ * @summary Type definitions that are used in the system
+ */
 export { default as AccountId } from './AccountId';
 export { default as AccountIndex } from './AccountIndex';
 export { default as Address } from './Address';
diff --git a/packages/types/src/types.ts b/packages/types/src/types.ts
index fce9492caa..317bb2765f 100644
--- a/packages/types/src/types.ts
+++ b/packages/types/src/types.ts
@@ -13,11 +13,38 @@ export type AnyString = string | String;
 
 export type AnyU8a = Uint8Array | Array<number> | string;
 
+/**
+ * @name Codec
+ * @description
+ * The base Codec interface. All types implement the interface provided here. Additionally
+ * implementors can add their own specific interfaces and helpres with getters and functions.
+ * The Codec Base is however required for operating as an encoding/decoding layer
+ */
 export interface Codec {
+  /**
+   * @description The length of the value when encoded as a Uint8Array
+   */
   encodedLength: number;
+
+  /**
+   * @description Returns a hex string representation of the value
+   */
   toHex (): string;
+
+  /**
+   * @description Converts the Object to JSON, typically used for RPC transfers
+   */
   toJSON (): any;
+
+  /**
+   * @description Returns the string representation of the value
+   */
   toString (): string;
+
+  /**
+   * @description Encodes the value as a Uint8Array as per the parity-codec specifications
+   * @param isBare true when the value has none of the type-specific prefixes (internal)
+   */
   toU8a (isBare?: boolean): Uint8Array;
 }