diff --git a/LICENSE b/LICENSE
index 2d30a03..f9eb4f4 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,5 +1,7 @@
-Copyright 2012-2017 Bert Belder, and other contributors.
-All rights reserved.
+Copyright Bert Belder. All rights reserved.
+
+The red-black tree implementation:
+Copyright 2002 Niels Provos <provos@citi.umich.edu> All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are