Applies OK on 6.4 & 7.1 & 7.2
Not tried on 6.3

*** 6.2-RELEASE/src/usr.sbin/timed/timed/timed.8	Sun Jul 20 16:23:29 2008
--- new-generic/src/usr.sbin/timed/timed/timed.8	Sun Jul 20 17:00:01 2008
***************
*** 76,82 ****
  .Nm .
  This option may be specified multiple times
  to add more than one network to the list.
! .It Fl F Ar host ...
  .in +2
  .ti -2
  -
--- 76,82 ----
  .Nm .
  This option may be specified multiple times
  to add more than one network to the list.
! .It Fl F Ar host1 [host2 ...]
  .in +2
  .ti -2
  -
*** 100,105 ****
--- 100,115 ----
  .ti -2
  -
  Use full names eg time1.domain.com not time1.
+ .\" Not certain it is necessary, but sensible to get timed working.
+ .ti -2
+ -
+ Examples of legal syntax: "-F host1" "-F host1 host2 host"
+ "-F host1 -F host2 host3".
+ .ti -2
+ -
+ F is over ambitious, A gate running with -F own address, then 
+ seems to refuses to  to an internal host also runing as master, to
+ say "become a slave".
  .ti -2
  -
  .Fl F
*** 125,130 ****
--- 125,133 ----
  is not specified,
  all hosts on connected networks are treated as trustworthy.
  .in -2
+ .It Fl G Ar group
+ Set name of a single net group of trusted hosts.
+ .\"	An undocumented flag jhs@@@berklix spotted in timed.c
  .It Fl M
  Allow this host to become a
  .Nm