diff --git a/src/mame/drivers/expro02.cpp b/src/mame/drivers/expro02.cpp
index e0a14fbeb59..332c09b46c4 100644
--- a/src/mame/drivers/expro02.cpp
+++ b/src/mame/drivers/expro02.cpp
@@ -652,7 +652,7 @@ static INPUT_PORTS_START( zipzap )
 	PORT_DIPNAME( 0x0020, 0x0020, DEF_STR( Unknown ) )
 	PORT_DIPSETTING(      0x0020, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
-	PORT_DIPNAME( 0x0040, 0x0040, DEF_STR( Unknown ) )
+	PORT_DIPNAME( 0x0040, 0x0040, "Level Skip with Button 2" )
 	PORT_DIPSETTING(      0x0040, DEF_STR( Off ) )
 	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
 	PORT_DIPNAME( 0x0080, 0x0080, DEF_STR( Unknown ) )