diff --git a/docs/plan/M1.md b/docs/plan/M1.md
index c7c238f..129f185 100644
--- a/docs/plan/M1.md
+++ b/docs/plan/M1.md
@@ -1,6 +1,6 @@
 # Milestone M1: contracts and core skeleton
 
-- Status: In progress
+- Status: Done
 - Specification: `docs/spec/contracts.md` (section 10), `docs/spec/domain.md` (sections 8–9), `docs/spec/dart-language.md` (section 7)
 - ADR: — (no decision changed; interim hand-written DTOs pending spike T2; T21 documented in `open-questions.md`)
 
@@ -36,6 +36,8 @@ plan file; the agent loop itself (section 9) is **not** included.
 
 ## Outcome
 
+Core skeleton, contracts, domain, ports, state components, and DI implemented; provider_api/sdk/client remain scaffolds to be filled in M3/M5/M4; T2 partial, T21 documented.
+
 Implemented on 2026-10-19. `melos run ci` green; 144 tests in
 `alteri_one_core` plus the contracts suite.