diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 676591b..0d61782 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -18,6 +18,13 @@ and its applicable policy guide before related work. The
 [architecture policy](../policy/architecture.md) and accepted ADRs control
 architecture decisions.
 
+The finalized [registration backend design](https://gitea.maximumdirect.net/eric/CommandKit/src/commit/0d23676144ab1ce5047924e98f1ab6a2a9d6aeb6/docs/roadmap/registration-backend.md)
+is retained in Git history as the design background for this completed sequence.
+It covers shared installation and typed execution, captured metadata, neutral
+routing metadata, invocation-local adapter sessions, and integration preparation.
+Its two composition questions were resolved before implementation; current
+contracts remain with the owners linked above.
+
 The governing decisions include [optional modules](../adr/0010-optional-integration-modules.md),
 [captured declarations](../adr/0011-captured-declarations-and-installation.md),
 [dispatch and inputs](../adr/0001-command-dispatch-and-inputs.md),