diff --git a/board/skeleton/etc/init.d/S20driver-setup b/board/skeleton/etc/init.d/S20driver-setup
index 236ef73..ef3c748 100644
--- a/board/skeleton/etc/init.d/S20driver-setup
+++ b/board/skeleton/etc/init.d/S20driver-setup
@@ -19,4 +19,8 @@ case "$1" in
 		stop
 		start
 		;;
+	*)
+		echo "ERROR: Must be start, stop, or restart"
+		exit 1
+		;;
 esac