In Satellite Bug 1486696 - 'hammer host update' removes existing host https://bugzilla.redhat.com/show_bug.cgi?id=1486696 it was noted that there was adequate confusion about what hammer host update --parameters did. A bug was then opened to clarify this in the Satellite documentation for Hammer CLI

I have added the changes to both the hammer host update --parameters docs and hammer host set-parameters and will now create a pull request to add the same to the hammer help.