diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index af93ff6..b76c20a 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -1,6 +1,6 @@
 # Implementation Plan: Import Discovery and Dependency-Ready Ordering
 
-Status: Stages 1–2 complete; 17 implementation stages remain.
+Status: Stages 1–3 complete; 16 implementation stages remain.
 
 ## Authority, baseline, and execution
 
@@ -270,6 +270,11 @@ to describe implemented scheduling, linking ADR 0015.
 Acceptance: inheritance and facade inheritance suites pass; final values,
 presence, origins, and explanation agree; no alternate resolver remains.
 
+Completion: implemented in commit `6e40c16` (`Schedule sibling inheritance by
+dependency readiness`). Verified with engine inheritance and facade inheritance
+tests, `./scripts/check.sh`, and `git diff --check`. Nested scope discovery,
+projection budgets, and retained evidence remain in their existing owners.
+
 ## Stage 4 — Retain the import inclusion graph during acquisition
 
 Refactor `imports.go` and `load_input.go` so acquired contributions carry stable