diff --git a/drivers/staging/mt7621-eth/ethtool.h b/drivers/staging/mt7621-eth/ethtool.h
index 40b4cf011660..d0e97ae0d82e 100644
--- a/drivers/staging/mt7621-eth/ethtool.h
+++ b/drivers/staging/mt7621-eth/ethtool.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; version 2 of the License