1 files changed, 4 insertions, 0 deletions
diff --git a/README b/README
index e8fda53..1a601c8 100644
--- a/README
+++ b/README
@@ -36,6 +36,10 @@ Initialize (or update) submodules:
 
     ~$ make
 
+To enable communicating with the host via a simple Serial protocol, use
+
+    ~$ ENABLE_SERIAL=1 make
+
 
 Flash firmware
 ==============