-\fIip\fR. The \fB\-\-private\-key\fR, \fB\-\-certificate\fR, and
-\fB\-\-ca\-cert\fR options are mandatory when this form is used.
+\fIip\fR, either IPv4 or IPv6 address. If \fIip\fR is
+an IPv6 address, then wrap \fIip\fR with square brackets, e.g.:
+\fBpssl:6632:[::1]\fR. The \fB\-\-private\-key\fR,
+\fB\-\-certificate\fR, and \fB\-\-ca\-cert\fR options are mandatory
+when this form is used.