diff --git a/CLAUDE.md b/CLAUDE.md
index b50112f..373c9af 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -73,3 +73,4 @@ COS_APPID=
 - Middleware uses cookie check only (Prisma doesn't work in Edge Runtime)
 - Password hashing must use `hashPassword` from `better-auth/crypto` for compatibility
 - Session model requires `token` field with unique constraint
+- **Git commit messages must be written in Chinese**