diff --git a/python/openmx2dcore.py b/python/openmx2dcore.py
index decacc25..2f81d8f5 100644
--- a/python/openmx2dcore.py
+++ b/python/openmx2dcore.py
@@ -1,3 +1,20 @@
+#
+# DCore -- Integrated DMFT software for correlated electrons
+# Copyright (C) 2017 The University of Tokyo
+#
+# 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 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
 from __future__ import print_function
 import sys
 import numpy