diff --git a/COPYRIGHT b/COPYRIGHT
index 5c41b9aafd..e55b0ec212 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -27,11 +27,12 @@ Portions Copyright 1998-2003 Kurt D. Zeilenga.
 Portions Copyright 1998-2003 Net Boolean Incorporated.
 All rights reserved.
 
-Redistribution and use in source and binary forms are permitted
-provided that this notice is preserved.  The names of the copyright
-holders may not be used to endorse or promote products derived from
-this software without their specific prior written permission.  This
-software is provided ``as is'' without express or implied warranty.
+Redistribution and use in source and binary forms, with and without
+modification, are permitted provided that this notice is preserved.
+The names of the copyright holders may not be used to endorse or
+promote products derived from this software without their specific
+prior written permission.  This software is provided ``as is''
+without express or implied warranty.
 
 ---