diff --git a/docs/architecture.md b/docs/architecture.md
index 86fa5c5..90639b1 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -8,7 +8,8 @@ Idlegame is split into four layers.
 
 - `tickLoop.ts`: fixed-timestep accumulator. Large elapsed deltas, including
   offline catch-up, drain through the same tick path as active play.
-- `game.ts`: core game state, active action progress, and resource accrual.
+- `game.ts`: core game state, action queue, costs/unlocks on start, completion-driven
+  queue advancement (actions do not auto-repeat when the queue is empty).
 - `save.ts`: versioned save schema, serialized export/import strings, and
   offline elapsed calculation.
 - `num.ts`: branded numeric boundary and human-readable formatting.