diff --git a/firmware/README b/firmware/README
index 76b9dc45..25653b64 100644
--- a/firmware/README
+++ b/firmware/README
@@ -18,9 +18,7 @@ submodule:
 $ cd ..
 $ git submodule init
 $ git submodule update
-$ mkdir firmware/libopencm3/build
-$ cd firmware/libopencm3/build
-$ cmake ../
+$ cd firmware/libopencm3
 $ make