[Project_owners] How auto update looks for updates?

[Foreningen Selvet - Jesper Staun Hansen]

Hello

I've been looking for this on newsgroups and mozilla developer related 
site, but this seems like its "something everyone knows", but I dont :O

Well, I've made my first release on the 6th named "heroes-0.1.xpi" and 
then today named "heroes-0.2.xpi" and thrown them in downloads/, so far 
so good. While I wait for the mirrors to update, then I would like to 
hear how the client (firefox XULrunner update manager (at least thats 
what I think its called)) finds out I made a new version.


Thanks in advance.