diff --git a/components/engine/README.md b/components/engine/README.md
index c3c5d48053..c19d1e0a4a 100644
--- a/components/engine/README.md
+++ b/components/engine/README.md
@@ -63,6 +63,7 @@ Installing on Ubuntu 12.04 and 12.10
 
     ```bash
     cd docker-master
+    sudo ./docker pull base
     sudo ./docker run -i -t base /bin/bash
     ```