diff --git a/programs/pkey/dh_genprime.c b/programs/pkey/dh_genprime.c
index 45605e3..b83517a 100644
--- a/programs/pkey/dh_genprime.c
+++ b/programs/pkey/dh_genprime.c
@@ -1,7 +1,9 @@
 /*
  *  Diffie-Hellman-Merkle key exchange (prime generation)
  *
- *  Copyright (C) 2006-2007  Christophe Devine
+ *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
+ *
+ *  Copyright (C) 2009       Paul Bakker
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by