diff --git a/README.md b/README.md
index 27806c9..3e78434 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@
 To setup the build environment the first time:
 
 ```bash
-$ git submodule update --init
+$ git submodule update --init --recursive
 $ source bootstrap.sh
 $ gn gen out
 ```