Revoke a hostname user ID from the server host key. `n-' may be used
in place of `revoke-hostname'.
.TP
-.B add-revoker FINGERPRINT
-Add a revoker to the host's OpenPGP key. `o' may be be used in place
+.B add-revoker KEYID|FILE
+Add a revoker to the host's OpenPGP key. The key ID will be loaded
+from the keyserver. A file may be loaded instead of pulling the key
+from the keyserver by specifying the path to the file as the argument,
+or by specifying `-` to load from stdin. `o' may be be used in place
of `add-revoker'.
.TP
.B revoke-key