Gnupg 2.0.29 and git master commit fbe1cf67aadc5a33cf815ddbcfc9669e43caa123
in file gnupg.texi read:

"""@item --export-options @code{parameters}"""

""" @item export-attributes

Include attribute user IDs (photo IDs) while exporting. This is
useful to export keys if they are going to be used by an OpenPGP
program that does not accept attribute user IDs. Defaults to yes.

"""

The phrasing is causing slight confusion as it may be missunderstood.
(For example see http://lists.gnupg.org/pipermail/gnupg-de/2016-January/000442.html)

The question is what is useful?
If this refers to the "option" then a better phrasing would be

old: This is useful to export
new: Turning off this option is useful to export

Otherwise it can be missunderstood that turning on this option would be useful
for the mentioned export. (In order to take load from Werner, I try to assign
this minor issue to Neal. Good?)