diff --git a/GEMINI.md b/GEMINI.md
index d3cfb86..67e66a3 100644
--- a/GEMINI.md
+++ b/GEMINI.md
@@ -17,7 +17,9 @@ When a roadmap task (WBS) is completed:
 2.  **Set Completion**: Once verified, perform a "Set" of:
     *   `git commit`: With a descriptive message including the WBS ID.
     *   `git push`: To the remote repository.
-    *   **PR Creation**: Notify completion and prepare for PR (using available CLI tools or manual confirmation).
+    *   **PR Creation**: Notify completion and prepare for PR.
+
+**Rule: DO NOT modify `docs/ROADMAP_WBS.md`.** This file is for manual update only. The AI should only reference it for task sequence.
 
 ## File Mapping Clarification (WBS-2.1)
 The relationship is **GAS (Primary) → Python (Supplement/Engine)**.