-querying a keyserver if none is found in the user's keychain. search
-for a gpg key for the host in the Web of Trust. If a key is found, it
-will be added to the host_keys cache (see KEY CACHES) and any ssh keys
-for the host will be removed from the user's known_hosts file. If the
-found key is acceptable (see KEY ACCEPTABILITY), then the host's gpg
-key will be added to the known_hosts file. If no gpg key is found for
-the host, then nothing is done. If no hosts are specified, all hosts
-listed in the known_hosts file will be processed. `k' may be used in
-place of `update-known_hosts'.
-.TP
-.B update-userids [USERID]...
-Add/update a user ID to the authorized_user_ids file. The user IDs
-specified should be exact matches to OpenPGP user IDs. For each
-specified user ID, gpg will be queried for a key associated with that
-user ID, querying a keyserver if none is found in the user's keychain.
-If a key is found, it will be added to the user_keys cache (see KEY
-CACHES) and the user ID will be added to the user's
-authorized_user_ids file (if it wasn't already present). `u' may be
-used in place of `update-userids'.
-.TP
-.B remove-userids [USERID]...
-Remove a user ID from the authorized_user_ids file. The user IDs
-specified should be exact matches to OpenPGP user IDs. `r' may be
-used in place of `remove-userids'.
+querying a keyserver if specified. If a key is found, it will be
+converted to an ssh key, and any matching ssh keys will be removed
+from the user's known_hosts file. If the found key is acceptable (see
+KEY ACCEPTABILITY), then the key will be updated and re-added to the
+known_hosts file. If no gpg key is found for the host, then nothing
+is done. If no hosts are specified, all hosts listed in the
+known_hosts file will be processed. `k' may be used in place of
+`update-known_hosts'.