diff --git a/CHANGELOG.md b/CHANGELOG.md
index 72c967e97d..7db5c42d90 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Changes:
 - Re-add isPedantic check on storage decoding
 - Adjust capability detection (only on full-known historic `AccountInfo`)
 - Additional Xcm types
+- Adjust parachain types
 
 
 ## 4.8.1 May 2, 2021
diff --git a/packages/types/src/interfaces/parachains/definitions.ts b/packages/types/src/interfaces/parachains/definitions.ts
index 88666851ff..a4fb70f7b9 100644
--- a/packages/types/src/interfaces/parachains/definitions.ts
+++ b/packages/types/src/interfaces/parachains/definitions.ts
@@ -121,7 +121,8 @@ export default {
       availabilityVotes: 'BitVec',
       backers: 'BitVec',
       relayParentNumber: 'BlockNumber',
-      backedInNumber: 'BlockNumber'
+      backedInNumber: 'BlockNumber',
+      backingGroup: 'GroupIndex'
     },
     CandidateReceipt: {
       descriptor: 'CandidateDescriptor',