Wiki's not being added to xml sitemap ??

I am using the XML Sitemap Generator plugin (http://www.arnebrachhold.de/projects/wordpress-plugins/google-xml-sitemaps-generator/) on my wiki site - its working fine, except that NONE of the wiki pages are being added to it and I can see no option in the Sitemap plugin or wiki plugin to make this happen.

Any idea how I can do this?
Is there a different xml sitemap plugin that will include the wiki pages?