diff --git a/src/mame/drivers/taito_z.c b/src/mame/drivers/taito_z.c
index d1a001f817e..0a67d8d8fc9 100644
--- a/src/mame/drivers/taito_z.c
+++ b/src/mame/drivers/taito_z.c
@@ -2398,7 +2398,7 @@ static INPUT_PORTS_START( bsharkjjs )
 	PORT_START("IN1")	/* unused */
 	PORT_BIT( 0xff, IP_ACTIVE_LOW, IPT_UNUSED )
 
-	PORT_START("IN2")	/* b2-5 affect sound num in service mode but otherwise useless (?) */
+	PORT_START("IN2")
 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
 	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)