diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c
index 71a62ce..4583feb 100644
--- a/kernel/watchdog_hld.c
+++ b/kernel/watchdog_hld.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Detect hard lockups on a system
  *