diff --git a/COPYING b/COPYING
index dbd8ab0..64492ad 100644
--- a/COPYING
+++ b/COPYING
@@ -1,4 +1,4 @@
-Copyright 1988, 1998  The Open Group
+Copyright 1988, 1993, 1994, 1998  The Open Group
 
 Permission to use, copy, modify, distribute, and sell this software and its
 documentation for any purpose is hereby granted without fee, provided that