diff --git a/codex-rs/core/src/codex.rs b/codex-rs/core/src/codex.rs
index 65c91fccd3..a2daea0305 100644
--- a/codex-rs/core/src/codex.rs
+++ b/codex-rs/core/src/codex.rs
@@ -3197,9 +3197,7 @@ mod handlers {
     /// Apply turn-context history updates after rollback.
     ///
     /// Truncates the stored history by the requested rollback depth, then pads to match the
-    /// surviving user-turn count. If the latest user turn has a stored collaboration mode,
-    /// update the session configuration; otherwise, force re-injection of collaboration
-    /// instructions on the next turn.
+    /// surviving user-turn count.
     fn apply_rollback_turn_context_history(
         state: &mut SessionState,
         existing_turn_context_history: Vec<Option<TurnContextItem>>,