diff --git a/src/org_loop_route.py b/src/org_loop_route.py
index 980373d..baf8452 100644
--- a/src/org_loop_route.py
+++ b/src/org_loop_route.py
@@ -35,6 +35,7 @@ import uuid
 
 _NEW_STATUS = {"fast_lane": "coding", "full_replan": "planning_brd_prd_sdd"}
 _NEW_ORG_NODE = {"fast_lane": "coder", "full_replan": "planner"}
+# REQ-05/REQ-09 (docs/sdd/06-验收与测试锚点.md) loop_round boundary: loop_round >= _LOOP_LIMIT forces task.status -> blocked_pending_human.
 _LOOP_LIMIT = 3