diff --git a/README.md b/README.md
index 67f5af084..1d05936d5 100644
--- a/README.md
+++ b/README.md
@@ -492,7 +492,7 @@ You're never locked in. The system adapts.
 
 | Command | What it does |
 |---------|--------------|
-| `/gsd:map-codebase` | Analyze existing codebase before new-project |
+| `/gsd:map-codebase [area]` | Analyze existing codebase before new-project |
 
 ### Phase Management