Copyright for 1992 added
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 1070d13..5b5b9b2 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -1,5 +1,5 @@
 /***********************************************************
-Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
+Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
 Netherlands.
 
                         All Rights Reserved