Patching guidelines for hurd

[Suman]

All,
        I'm not quiet sure about the Hurd patch guide lines. I would
like to know if there is any document existing which precisely talks
about the patch guidelines. If so, would you point me to it? I'm not
very much sure whether I can send patch as an attachment or not.
         In short, can any one tell me what's all the information that
I need to provide along with patch. Any help in this regard is highly
appreciated.

Thanks
Suman.