在http://www.intickets.gr/上订票，所谓0 piece行李是什

十月初去希腊旅游，回程打算搭乘晚上七点四十五的爱琴海航空航班从米岛返回雅典，接驳凌晨12:55的俄罗斯航空航班从雅典返回上海。国际段机票已订，打算在http://www.intickets.gr/购买米岛回雅典的机票，里面看到一条关于行李的条款：
LUGGAGE:

LUGGAGE: Kindly check the NEW BAGGAGE POLICY of Airlines!
If the baggage field shows "0 PIECE" you can carry 1 hand luggage up to 8kg.
If you wish to add baggage up to 20kg, please contact our office after the Booking creation.
Tickets are non-refundable.
Tickets should be issued before Thursday, July 10, 2014*.
.

请教有在此网站订票经验的同学，这个条款的意思是我只能携带一件手提行李，如果有托运行李，需要额外再付费的是吗