diff --git a/Installation/include/CGAL/stddef.h b/Installation/include/CGAL/stddef.h
index 03d4022a812..02cc2756a9b 100644
--- a/Installation/include/CGAL/stddef.h
+++ b/Installation/include/CGAL/stddef.h
@@ -1 +1,18 @@
+// Copyright (c) 2017 GeometryFactory, Sophia Antipolis (France)
+//  All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation; either version 3 of the License,
+// or (at your option) any later version.
+//
+// Licensees holding a valid commercial license may use this file in
+// accordance with the commercial license agreement provided with the software.
+//
+// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+//
+// $URL$
+// $Id$
+
 #error You have added .../path/to/CGAL-x.y/include/CGAL to the INCLUDE path. You should use .../path/to/CGAL-x.y/include instead.