-Update the known_hosts file. For every host listed, search for a gpg
-key for the host in the Web of Trust. If a key is found, any ssh keys
-for the host are removed from the known_hosts file. If the found key
-is acceptable (see KEY ACCEPTABILITY), then the gpg key is converted
-to an ssh key and 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. If they
-
-`k' may be used in place of `update-known_hosts'.
+Update the known_hosts file. For each specified host, gpg will be
+queried for a key associated with the host URI (see HOST URIs),
+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'.