diff --git a/Makefile b/Makefile
index 0867814780a3345fcd06e0a8979e06c5809e7cf1..2ea9b813cb1d9239dad233769171d6583e0c914d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@
 # - button_contact
 # - timer_test
 # - button_toggle
+# - button_serial
 #
 # To program a board, first make sure the PROGRAMMER variable is set correctly.
 # (If you're using your own HTM(a)A programmer board, use usbtiny.) Each board