Index: usr.bin/systat/proc.c
===================================================================
--- usr.bin/systat/proc.c
+++ usr.bin/systat/proc.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2021 Yoshihiro Ota
  *
  * Redistribution and use in source and binary forms, with or without
Index: usr.bin/systat/sysput.c
===================================================================
--- usr.bin/systat/sysput.c
+++ usr.bin/systat/sysput.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2019, 2020 Yoshihiro Ota
  *
  * Redistribution and use in source and binary forms, with or without