diff --git a/audio_dummy.c b/audio_dummy.c
index a544031b..659a7202 100644
--- a/audio_dummy.c
+++ b/audio_dummy.c
@@ -3,6 +3,10 @@
  * Copyright (c) James Laird 2013
  * All rights reserved.
  *
+ * Modifications for audio synchronisation
+ * and related work, copyright (c) Mike Brady 2014
+ * All rights reserved.
+ *
  * Permission is hereby granted, free of charge, to any person
  * obtaining a copy of this software and associated documentation
  * files (the "Software"), to deal in the Software without