diff --git a/architecture.md b/architecture.md
index c8037a2..945c195 100644
--- a/architecture.md
+++ b/architecture.md
@@ -48,7 +48,7 @@ app/index.js       : the page — input, screens, main loop
 `render` draws from the state object returned by `ISLE_CORE.createGame`;
 `audio` plays the events the core appends to `state.events`.
 
-## Physics model (RC-375D84, landed 2026-09-29)
+## Physics model (landed 2026-09-29)
 
 The simulation is a deterministic impulse-ish engine: bodies integrate under
 gravity at fixed 1/120 s, contacts resolve positionally, and damage routes