Sitemap.xml for Multisites

Hello, we're launching some sites in a network and are using the WPMU domain mapping tool so we can use domains like http://www.domainsub.com

After we create them and goto http://www.domainsub.com/sitemap.xml

The sitemap is showing the urls domainsub.rootdomain.com/page.php
instead of domainsub.com/page.php

Does this update automatically at some point?

Thanks