diff --git a/README.md b/README.md
index 6d054f5..6bb0263 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ loads) builds, deploys, hooks, and logs from a real game launch. Engine code acc
 `src/mars/` and `src/game/`; each module is oracle-verified against the owner's game data before merge:
 - `mars/parse` — brace-block + `.effect` readers (1,531/1,531 files agree with the reference)
 - `mars/text` — flat key/value tables, id manifests, CSV (64/64 files agree)
+- `game/sim` — strategic formulas (economy, research, colonies, movement) as pure functions; 356 hand-computed checks
 
 Build: `cmake --preset host && cmake --build --preset host && ctest --preset host` (Linux);
 `tools/sync-build.sh` cross-builds the shim on the lab box and stages it for deployment.