diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index a1a44f94c171..1e75813b9f34 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -4,6 +4,8 @@
  * Copyright (C) 2005 SGI, Christoph Lameter
  * Copyright (C) 2006 Nick Piggin
  * Copyright (C) 2012 Konstantin Khlebnikov
+ * Copyright (C) 2016 Intel, Matthew Wilcox
+ * Copyright (C) 2016 Intel, Ross Zwisler
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as