diff --git a/src/oldpool.cpp b/src/oldpool.cpp
--- a/src/oldpool.cpp
+++ b/src/oldpool.cpp
@@ -1,6 +1,6 @@
 /* $Id$ */
 
-/** @file oldpool.cpp */
+/** @file oldpool.cpp Implementation of the old pool. */
 
 #include "stdafx.h"
 #include "openttd.h"