diff --git a/FDTD/operator_ext_cylinder.cpp b/FDTD/operator_ext_cylinder.cpp
index e29eae1..4c3fbf9 100644
--- a/FDTD/operator_ext_cylinder.cpp
+++ b/FDTD/operator_ext_cylinder.cpp
@@ -1,3 +1,20 @@
+/*
+*	Copyright (C) 2010 Thorsten Liebig (Thorsten.Liebig@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 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 <http://www.gnu.org/licenses/>.
+*/
+
 #include "operator_ext_cylinder.h"
 #include "operator_cylinder.h"
 #include "engine_ext_cylinder.h"
diff --git a/FDTD/operator_ext_cylinder.h b/FDTD/operator_ext_cylinder.h
index 26730d2..b880d39 100644
--- a/FDTD/operator_ext_cylinder.h
+++ b/FDTD/operator_ext_cylinder.h
@@ -1,3 +1,20 @@
+/*
+*	Copyright (C) 2010 Thorsten Liebig (Thorsten.Liebig@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 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 <http://www.gnu.org/licenses/>.
+*/
+
 #ifndef OPERATOR_EXT_CYLINDER_H
 #define OPERATOR_EXT_CYLINDER_H