diff --git a/block/blk-throttle.h b/block/blk-throttle.h
index 7964cc041e06..f9f8666891ab 100644
--- a/block/blk-throttle.h
+++ b/block/blk-throttle.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef BLK_THROTTLE_H
 #define BLK_THROTTLE_H