diff --git a/src/firmware_update.c b/src/firmware_update.c
index 3cab7d0..22b4387 100644
--- a/src/firmware_update.c
+++ b/src/firmware_update.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #include "firmware_update.h"
 #include "utils.h"
 #include <endian.h>