diff --git a/sys/ddb/db_capture.c b/sys/ddb/db_capture.c
index de958d60a46..056edef437c 100644
--- a/sys/ddb/db_capture.c
+++ b/sys/ddb/db_capture.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2007 Robert N. M. Watson
  * All rights reserved.
  *
diff --git a/sys/ddb/db_script.c b/sys/ddb/db_script.c
index f84dfb936ea..92e5b20ab2a 100644
--- a/sys/ddb/db_script.c
+++ b/sys/ddb/db_script.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2007 Robert N. M. Watson
  * All rights reserved.
  *
diff --git a/sys/ddb/db_textdump.c b/sys/ddb/db_textdump.c
index ba7c387fed5..8845781621f 100644
--- a/sys/ddb/db_textdump.c
+++ b/sys/ddb/db_textdump.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2007 Robert N. M. Watson
  * All rights reserved.
  *
diff --git a/sys/ddb/db_thread.c b/sys/ddb/db_thread.c
index e85d0cd7ab4..98f2aa258d3 100644
--- a/sys/ddb/db_thread.c
+++ b/sys/ddb/db_thread.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2004 Marcel Moolenaar
  * All rights reserved.
  *