diff --git a/docs/plans/2026-09-26_lead-decisions.md b/docs/plans/2026-09-26_lead-decisions.md
index 3c02ba58..3548c498 100644
--- a/docs/plans/2026-09-26_lead-decisions.md
+++ b/docs/plans/2026-09-26_lead-decisions.md
@@ -428,3 +428,8 @@ which stay with him. Each item names who decided it and what happened.
     brief, the earlier rounds and the six review reports. Sage names the
     source author after queue A2 lands, so Darkwing isn't split between
     them. The code may not start before then.
+34. **CHAT-03 build note, Filbert n3.** Under items 30 and 31, only the
+    controller's `abort` can produce `aborted`. If the code ever sees
+    `aborted` with no stop in progress, it treats it as an overlap signal.
+    It does not invent a stop link. This goes into the build and its tests,
+    and the pinned brief stays as it is.