Grief Prevention-Limit Worlds

I am setting up a new world with grief prevention. I want to limit which worlds use it in the documentation it states:

However in my version of the config.yml there is nothing listed (dev build #158) I have tried to add it manually:

Claims:
Worlds:
- world

It seems to strip this out and of course doesnt work. Any help to limit the worlds Grief Prevention is active on would be greatly appreciated.

This is my entire config.yml file http://pastebin.com/8cxpSt6c

I have gotten the info from the author of this fantastic plugin. if you all need something that does it all protects land, allows players claims, flexible check it out for sure. http://dev.bukkit.org/bukkit-plugins/grief-prevention/#comments

EDIT by Moderator: merged posts, please use the edit button instead of double posting.