.Sx Miscellaneous Options .
While there is a rich set of options available,
the only required option is one or more
+.Ic pool ,
.Ic server ,
.Ic peer ,
.Ic broadcast
See IPv6 references for the
equivalent classes for that address family.
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+.It Xo Ic pool Ar address
+.Op Cm burst
+.Op Cm iburst
+.Op Cm version Ar version
+.Op Cm prefer
+.Op Cm minpoll Ar minpoll
+.Op Cm maxpoll Ar maxpoll
+.Xc
.It Xo Ic server Ar address
.Op Cm key Ar key \&| Cm autokey
.Op Cm burst
.Xc
.El
.Pp
-These four commands specify the time server name or address to
+These five commands specify the time server name or address to
be used and the mode in which to operate.
The
.Ar address
provided in
.Pa /usr/share/doc/ntp ) .
.Bl -tag -width indent
+.It Ic pool
+For type s addresses, this command mobilizes a persistent
+client mode association with a number of remote servers.
+In this mode the local clock can synchronized to the
+remote server, but the remote server can never be synchronized to
+the local clock.
.It Ic server
For type s and r addresses, this command mobilizes a persistent
client mode association with the specified remote server or local