diff --git a/README.md b/README.md
index 21c091cc4e..a4bec4134c 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,7 @@ go get -u github.com/ry/v8worker2
 cd $GOPATH/src/github.com/ry/v8worker2
 ./build.py --use_ccache
 ```
+Maybe also run `git submodule update --init` in the v8worker2 dir.
 
 Finally you can get `deno` and its other Go deps.