diff --git a/src/mame/drivers/dynax.cpp b/src/mame/drivers/dynax.cpp
index 2df382fecae..bc52c62c14d 100644
--- a/src/mame/drivers/dynax.cpp
+++ b/src/mame/drivers/dynax.cpp
@@ -3757,16 +3757,16 @@ static INPUT_PORTS_START( tenkai )
 	PORT_DIPNAME( 0x04, 0x04, "Girls (Demo)" )
 	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x04, DEF_STR( On ) )
-	PORT_DIPNAME( 0x08, 0x08, "Unknown 2-3" )
+	PORT_DIPNAME( 0x08, 0x08, "In-Game Bet?" )
 	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
 	PORT_DIPNAME( 0x10, 0x10, "Unknown 2-4" )
 	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x20, 0x20, "Unknown 2-5" )
+	PORT_DIPNAME( 0x20, 0x20, "Auto Tsumo after Reach" )
 	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_DIPNAME( 0x40, 0x40, "Unknown 2-6" )
+	PORT_DIPNAME( 0x40, 0x40, "Last Chance" )
 	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
 	PORT_DIPNAME( 0x80, 0x80, "DonDen Key" )