diff --git a/README.md b/README.md
index 3e960b9..a0bc645 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ Here is the procedure on how to work with the GitHub repo, when you want to star
 3. When your code is ready to merge, pls create a PULL REQUEST from your repo to the origin repo
 4. Before merging, pls make sure you have run the following commands:
    ```console
+   git submodule update --init
    npm install
    npm run build
    ```