diff --git a/src/newgrf_railtype.h b/src/newgrf_railtype.h
--- a/src/newgrf_railtype.h
+++ b/src/newgrf_railtype.h
@@ -1,5 +1,14 @@
 /* $Id$ */
 
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file newgrf_railtype.h NewGRF handling of rail types. */
+
 #ifndef NEWGRF_RAILTYPE_H
 #define NEWGRF_RAILTYPE_H