diff --git a/README.md b/README.md
index d44c1c2..f66d9f2 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,10 @@
 Python interface to the Pantograph library
 
 ## Getting started
+Update submodule
+``` bash
+git submodule update --init
+```
 
 Execute
 ```bash