specified, then all accounts on the system are processed. `u' may be
used in place of `update-users'.
.TP
-.B gen-key
-Generate a OpenPGP key pair for the host. `g' may be used in place of
-`gen-key'.
+.B gen-key [HOSTNAME]
+Generate a OpenPGP key pair for the host. If HOSTNAME is not
+specified, then the system fully-qualified domain name will be user.
+`g' may be used in place of `gen-key'.
.TP
.B show-fingerprint
Show the fingerprint for the host's OpenPGP key. `f' may be used in place of