diff --git a/COPYING b/COPYING
index 8bbb3c38..efc1a949 100644
--- a/COPYING
+++ b/COPYING
@@ -1,3 +1,4 @@
+Copyright © 2006-2009 Simon Thum
 Copyright © 2008-2012 Kristian Høgsberg
 Copyright © 2010-2012 Intel Corporation
 Copyright © 2010-2011 Benjamin Franzke
diff --git a/src/filter.c b/src/filter.c
index b953bee8..626cb0aa 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright © 2006-2009 Simon Thum
  * Copyright © 2012 Jonas Ådahl
  *
  * Permission to use, copy, modify, distribute, and sell this software and