diff --git a/sys/dev/sound/pcm/vchan.c b/sys/dev/sound/pcm/vchan.c
index 8ba8138e55f..528c6fa6262 100644
--- a/sys/dev/sound/pcm/vchan.c
+++ b/sys/dev/sound/pcm/vchan.c
@@ -4,6 +4,10 @@
  * Copyright (c) 2006-2009 Ariff Abdullah <ariff@FreeBSD.org>
  * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
  * All rights reserved.
+ * Copyright (c) 2024 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by Christos Margiolis
+ * <christos@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions