diff --git a/spi25_prepare.c b/spi25_prepare.c
index 3efc83b..619a8d0 100644
--- a/spi25_prepare.c
+++ b/spi25_prepare.c
@@ -1,6 +1,9 @@
 /*
  * This file is part of the flashprog project.
  *
+ * Copyright (C) 2017, 2018 secunet Security Networks AG
+ * Copyright (C) 2024 Nico Huber <nico.h@gmx.de>
+ *
  * 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
  * the Free Software Foundation; either version 2 of the License, or