The flag change was made long time ago, so there is no known
documentation written which could be wrong.
Also: there is a help flag and the error is unrelated
to the flag name.
Also: there were made a couple of changes to sync the
flags/parms of v.surf.rst and v.vol.rst which is more
important than maintaining a single flag 'till GRASS 7.
Markus
-------------------------------------------- Managed by Request Tracker