diff --git a/docs/m21-plan.md b/docs/m21-plan.md
index e787a02..3fea641 100644
--- a/docs/m21-plan.md
+++ b/docs/m21-plan.md
@@ -101,8 +101,7 @@ auto-merge to main when the branch is green; keep the branch; push everything.
       testing where PID 1 isn't init — and writes SLP_TYP|SLP_EN from ring 3.
       `orderly-shutdown` scenario proves button → shutting-down → S5 → QEMU
       exit; suite 60/60).
-- [ ] **merge** `feat/power-events` → main, push, keep the branch — **loop
-      ends here**.
+- [x] **merge** `feat/power-events` → main, push, keep the branch (merged 2026-07-13) — **M21 complete**.
 
 ---