diff --git a/COPYRIGHT b/COPYRIGHT
index 6a0132a2db..d9edce66c2 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -25,6 +25,8 @@ Additional information about OpenLDAP can be obtained at:
 
 Portions Copyright 1998-2003 Kurt D. Zeilenga.
 Portions Copyright 1998-2003 Net Boolean Incorporated.
+Portions Copyright 1999-2003 Howard Y.H. Chu.
+Portions Copyright 1999-2003 Symas Corporation.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without