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-rw-r--r--bin/sh/mail.h2
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diff --git a/bin/sh/mail.h b/bin/sh/mail.h
index a577a0fb21a6..0bb565209c7f 100644
--- a/bin/sh/mail.h
+++ b/bin/sh/mail.h
@@ -1,4 +1,6 @@
/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*