diff --git a/README.md b/README.md
index 9e18444..d2c9129 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,10 @@ rustup override set nightly
 cargo build -Z build-std
 ```
 
+In .../obsw/
 ```sh
+git submodule init
+git submodule update
 mkdir build_cli
 cd build_cli
 cmake -DCMAKE_TOOLCHAIN_FILE=../bsp_z7/cmake/arm-none-eabi.toolchain ..