1 files changed, 3 insertions, 0 deletions

diff --git a/bus.c b/bus.c
index 9e23586..64a8ac9 100644
--- a/bus.c
+++ b/bus.c
@@ -1,3 +1,6 @@
+/* SPDX-License-Identifier: Unlicense
+ */
+
 #include "bus.h"
 
 #include <assert.h>