diff --git a/lib/decryption/decryption_impl.cc b/lib/decryption/decryption_impl.cc
index 5fa0c03..551afa4 100644
--- a/lib/decryption/decryption_impl.cc
+++ b/lib/decryption/decryption_impl.cc
@@ -1,8 +1,8 @@
 /* -*- c++ -*- */
 /*
  * @file
- * @author Piotr Krysik <ptrkrysik@gmail.com>
- * @author Roman Khassraf <rkhassraf@gmail.com>
+ * @author (C) 2014 by Piotr Krysik <ptrkrysik@gmail.com>
+ * @author (C) 2015 by Roman Khassraf <rkhassraf@gmail.com>
  * @section LICENSE
  *
  * Gr-gsm is free software; you can redistribute it and/or modify
diff --git a/lib/decryption/decryption_impl.h b/lib/decryption/decryption_impl.h
index d5332d4..aa6e5ac 100644
--- a/lib/decryption/decryption_impl.h
+++ b/lib/decryption/decryption_impl.h
@@ -1,7 +1,7 @@
 /* -*- c++ -*- */
 /*
  * @file
- * @author Piotr Krysik <ptrkrysik@gmail.com>
+ * @author (C) 2014 by Piotr Krysik <ptrkrysik@gmail.com>
  * @section LICENSE
  *
  * Gr-gsm is free software; you can redistribute it and/or modify