+.B extend-key EXPIRE
+Extend the validity of the OpenPGP key for the host until EXPIRE from
+the present. If EXPIRE is not specified, then the user will be
+prompted for the extension term. Expiration is specified like GnuPG
+does:
+.nf
+ 0 = key does not expire
+ <n> = key expires in n days
+ <n>w = key expires in n weeks
+ <n>m = key expires in n months
+ <n>y = key expires in n years
+.fi
+`e' may be used in place of `extend-key'.
+.TP
+.B add-hostname HOSTNAME
+Add a hostname user ID to the server host key. `n+' may be used in
+place of `add-hostname'.
+.TP
+.B revoke-hostname HOSTNAME
+Revoke a hostname user ID from the server host key. `n-' may be used
+in place of `revoke-hostname'.
+.TP
+.B show-key
+Output gpg information about host's OpenPGP key. `s' may be used in
+place of `show-key'.