Copyright for 1992 added
diff --git a/Parser/pgen.c b/Parser/pgen.c
index bd1610e..d88245b 100644
--- a/Parser/pgen.c
+++ b/Parser/pgen.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