diff --git a/src/mame/drivers/witch.cpp b/src/mame/drivers/witch.cpp
index 6641135e0c2..782ae789f8a 100644
--- a/src/mame/drivers/witch.cpp
+++ b/src/mame/drivers/witch.cpp
@@ -1189,7 +1189,7 @@ ROM_START( pbchmp95 ) /* Licensed for Germany? */
 	ROM_LOAD( "tbp24s10n.10k", 0x000, 0x100, CRC(ee7b9d8f) SHA1(3a7b75befab83bc37e4e403ad3632841c2d37707) ) /* Currently unused, unknown use */
 ROM_END
 
-ROM_START( keirinou )
+ROM_START( keirinou ) /* ES8611 PCB */
 	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASE00 )
     ROM_LOAD( "y5-03.y5",     0x000000, 0x008000, CRC(df2acc37) SHA1(9ad953843ba7859a55888fb87591cc8d322136ad) )