diff --git a/README.md b/README.md
index 510bba5..4dd59e6 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ There are three ways to install your own copy:
 
 First get the source code:
 
-    git clone https://gitlab.com/depesz/explain.depesz.com.git
+    git clone --recurse-submodules https://gitlab.com/depesz/explain.depesz.com.git
 
 ## Vagrant setup