diff --git a/lib/of-reconfig-notifier-error-inject.c b/lib/of-reconfig-notifier-error-inject.c
index 8dc7986..b26f164 100644
--- a/lib/of-reconfig-notifier-error-inject.c
+++ b/lib/of-reconfig-notifier-error-inject.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>