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-rw-r--r--sys/sys/_mutex.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/sys/_mutex.h b/sys/sys/_mutex.h
index 5da137a0de4b..e37226cc8e5d 100644
--- a/sys/sys/_mutex.h
+++ b/sys/sys/_mutex.h
@@ -1,4 +1,6 @@
/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without