diff --git a/include/nana/stdc++.hpp b/include/nana/stdc++.hpp
index 8730d806..c21d8a94 100644
--- a/include/nana/stdc++.hpp
+++ b/include/nana/stdc++.hpp
@@ -1,7 +1,7 @@
 /**
  *	Standard Library for C++11/14/17
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2017-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
diff --git a/source/gui/programming_interface.cpp b/source/gui/programming_interface.cpp
index 9ddf5842..7ed9883f 100644
--- a/source/gui/programming_interface.cpp
+++ b/source/gui/programming_interface.cpp
@@ -1,7 +1,7 @@
 /*
  *	Nana GUI Programming Interface Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
diff --git a/source/paint/graphics.cpp b/source/paint/graphics.cpp
index 8f3de517..c620f63d 100644
--- a/source/paint/graphics.cpp
+++ b/source/paint/graphics.cpp
@@ -1,7 +1,7 @@
 /*
  *	Paint Graphics Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at