diff --git a/.env.example b/.env.example
index 4b2fb40e72..40d6f63b47 100644
--- a/.env.example
+++ b/.env.example
@@ -8,6 +8,8 @@ VERDACCIO_PORT=10104
 
 ################# NOCOBASE APPLICATION #################
 
+# !!! When `APP_ENV=production`, opening http://localhost:13000/ will show "Not Found".
+# !!! It is recommended to use nginx to proxy static files. For example https://github.com/nocobase/nocobase/blob/main/docker/nocobase/nocobase.conf
 APP_ENV=development
 APP_PORT=13000
 APP_KEY=test-key