The following explanation is only present in the release docs, not in the documentation itself: Private Attachments and Comments If you are in the "insider group," you can mark certain attachments and comments as private, and then they will be invisible to users who are not in the insider group. Users will know that a comment was hidden (because the comment numbering will look something like "1, 2, 3, 5" to them), but they will not be able to access its contents.
Insidergroup is documented briefly here: http://bugzilla.readthedocs.org/en/latest/administering/parameters.html but perhaps could be expanded. Gerv
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