diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c
--- a/sys/dev/sound/pcm/dsp.c
+++ b/sys/dev/sound/pcm/dsp.c
@@ -5,6 +5,10 @@
  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
  * Copyright (c) 1999 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
diff --git a/sys/dev/sound/pcm/sndstat.c b/sys/dev/sound/pcm/sndstat.c
--- a/sys/dev/sound/pcm/sndstat.c
+++ b/sys/dev/sound/pcm/sndstat.c
@@ -5,6 +5,10 @@
  * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
  * Copyright (c) 2020 The FreeBSD Foundation
  * 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.
  *
  * Portions of this software were developed by Ka Ho Ng
  * under sponsorship from the FreeBSD Foundation.
diff --git a/sys/dev/sound/pcm/sound.c b/sys/dev/sound/pcm/sound.c
--- a/sys/dev/sound/pcm/sound.c
+++ b/sys/dev/sound/pcm/sound.c
@@ -6,6 +6,10 @@
  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
  * Copyright (c) 1997 Luigi Rizzo
  * 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