diff --git a/README.md b/README.md
index 4889a54ed..69b594c2d 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@ pip3 install pymisp
 
 ```
 git clone https://github.com/MISP/PyMISP.git && cd PyMISP
+git submodule update --init
 pip3 install -I .
 ```