diff --git a/sound/win32_s.c b/sound/win32_s.c
--- a/sound/win32_s.c
+++ b/sound/win32_s.c
@@ -1,3 +1,5 @@
+/* $Id$ */
+
 #include "stdafx.h"
 #include "openttd.h"
 #include "driver.h"