diff --git a/pyext/GMatrix.i b/pyext/GMatrix.i
index e0afa68..6d091c1 100755
--- a/pyext/GMatrix.i
+++ b/pyext/GMatrix.i
@@ -4,10 +4,18 @@
  *  copyright (C) 2008-2011 by Jurgen Knodlseder                           *
  * ----------------------------------------------------------------------- *
  *                                                                         *
- *   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     *
- *   (at your option) any later version.                                   *
+ *  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/>.  *
  *                                                                         *
  ***************************************************************************/
 %{
@@ -27,9 +35,10 @@
 class GMatrix : public GMatrixBase {
 public:
     // Constructors and destructors
+    GMatrix(void);
     GMatrix(int rows, int cols);
     GMatrix(const GMatrix& m);
-    virtual ~GMatrix();
+    virtual ~GMatrix(void);
 
     // Operators
     GMatrix  operator+ (const GMatrix& m) const;