diff --git a/README.md b/README.md
index 0169fb18fd8501442c6ead118981cb6258dd1247..ee88134f566cc20a490ba8a74614d3e6fa33ddd8 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,9 @@ Get the source code
 
 ```
 git clone https://github.com/Qihoo360/pika.git
+
+git submodule init
+git submodule update
 ```