diff --git a/src/table/train_cmd.h b/src/table/train_cmd.h
--- a/src/table/train_cmd.h
+++ b/src/table/train_cmd.h
@@ -1,5 +1,7 @@
 /* $Id$ */
 
+/** @file train_cmd.h Sprites to use for trains. */
+
 static const SpriteID _engine_sprite_base[] = {
 0x0B59, 0x0B61, 0x0B69, 0x0BE1, 0x0B71, 0x0B75, 0x0B7D, 0x0B7D,
 0x0B85, 0x0B85, 0x0B8D, 0x0B8D, 0x0BC9, 0x0BD1, 0x0BD9, 0x0BE9,