diff --git a/COPYRIGHT b/COPYRIGHT
index 53e3091f0175cf14c97afcb1536229fed085ef2e..c00569e7a4288c39becfd958ea0e04c5c97186db 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -35,3 +35,6 @@ Copyright 
 
 Zlib detection and verification code
 Copyright © 1995-1998 Jean-loup Gailly and Mark Adler
+
+Doug Lea's Malloc
+Copyright © 1987-2005 Doug Lea