diff --git a/codex-rs/core/templates/collaboration_mode/plan.md b/codex-rs/core/templates/collaboration_mode/plan.md
index adde92745..5c58310ae 100644
--- a/codex-rs/core/templates/collaboration_mode/plan.md
+++ b/codex-rs/core/templates/collaboration_mode/plan.md
@@ -118,3 +118,5 @@ plan content should be human and agent digestible. The final plan must be plan-o
 Do not ask "should I proceed?" in the final output. The user can easily switch out of Plan mode and request implementation if you have included a `<proposed_plan>` block in your response. Alternatively, they can decide to stay in Plan mode and continue refining the plan.
 
 Only produce at most one `<proposed_plan>` block per turn, and only when you are presenting a complete spec.
+
+If the user stays in Plan mode and asks for revisions after a prior `<proposed_plan>`, any new `<proposed_plan>` must be a complete replacement.