diff --git a/block/blk-timeout.c b/block/blk-timeout.c
index 124c261..8aa68fa 100644
--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Functions related to generic timeout handling of requests.
  */