diff --git a/README.md b/README.md
index fe5b7d9..68ec1e4 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ Another useful tool is GTKWave, install it if you want to use the waveform files
 
 ### Change into docker container & install requirements
 ```
-$ git clone https://git.goodcleanfun.de/tmeissner/cocotb_with_ghdl.git
+$ git clone --recursive https://git.goodcleanfun.de/tmeissner/cocotb_with_ghdl.git
 $ cd cocotb_with_ghdl
 $ ./env-setup.sh
 $ docker run --rm -ti --volume=$(pwd):/build -e DISPLAY=$DISPLAY \