Change option for a MUC room

Hi every body.I use ejabberd 15.09 and I want to change option for room. who to do that?
In this link
https://docs.ejabberd.im/admin/ejabberdctl/muc-admin/#change-option-for-a...
said that you can do that using follow command:
ejabberdctl change_room_option room_name muc_service options_list

but I dont know what is options_list format. for example I want change history size or member only of room. how do that?

Example usage: $ ejabberdctl

Example usage:

$ ejabberdctl change_room_option room1 conference.localhost members_only true

Note, however, that not all room options can be modified that way. Only the ones listed in the ejabberd Guide under "default_room_options", see
https://docs.ejabberd.im/admin/guide/configuration/#modmuc

You can also see them in the source code, in lines 756 and 788:
https://github.com/processone/ejabberd/blob/master/src/mod_muc_admin.erl...

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