diff --git a/src/dummy_land.cpp b/src/dummy_land.cpp
--- a/src/dummy_land.cpp
+++ b/src/dummy_land.cpp
@@ -1,6 +1,6 @@
 /* $Id$ */
 
-/** @file dummy_land.cpp */
+/** @file dummy_land.cpp Handling of void (or dummy) tiles. */
 
 #include "stdafx.h"
 #include "openttd.h"