Please see Debian BTS entry #291110 for the details of the submission, and the patch provided; basically, it proposes changes in the logic to decide which subscribers receive email about changes to pages with Private in the name.
This can be viewed at http://bugs.debian.org/291110
Origional bug submitted by Brian T. Sniffen, ZWiki bug filed by Joel Aelwyn (Debian ZWiki maintainer) as upstream/forward.