diff --git a/README.md b/README.md
index 25d97bf3ca3446300119caa6bb11332b3c35b121..17afd5663c58922c88a50c2246fbb97271533b24 100644
--- a/README.md
+++ b/README.md
@@ -134,6 +134,7 @@ sudo ./Build install
 If you are using the Git repository, use the following commands:
 
 ```
+git submodule update --init
 ./Build
 ./Build manifest
 ./Build test