diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 5b5b9b2..22c20b0 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -1,6 +1,6 @@
 /***********************************************************
-Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
-Netherlands.
+Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
+Amsterdam, The Netherlands.
 
                         All Rights Reserved