docker parameter is --hostname not --host

It look like there was once a bug in the docker help command that advertised hostname command being --host while it's really --hostname (or -h).
It seems to have been corrected in commit https://github.com/dotcloud/docker/commit/198f8d7884
crane's --host doesn't work (neither on 0.8.1 or 0.9.1 tested both).