-.\" $OpenBSD: pf.conf.5,v 1.598 2022/11/09 23:00:00 sashan Exp $
+.\" $OpenBSD: pf.conf.5,v 1.599 2022/11/10 19:07:21 jmc Exp $
.\"
.\" Copyright (c) 2002, Daniel Hartmeier
.\" Copyright (c) 2003 - 2013 Henning Brauer <henning@openbsd.org>
.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd $Mdocdate: November 9 2022 $
+.Dd $Mdocdate: November 10 2022 $
.Dt PF.CONF 5
.Os
.Sh NAME
100 per 10 seconds again.
.Pp
.It Cm once
-Creates a one shot rule. The first matching packet marks rule as expired.
-The expired rule is never evaluated then.
+Creates a one shot rule.
+The first matching packet marks the rule as expired;
+any expired rules are no longer evaluated.
+Expired rules are only shown in verbose mode (-vv):
.Xr pfctl 8
-does not report expired rules unless run in verbose mode ('-vv'). In verbose
-mode
-.Xr pfctl 8
-appends '# expired' to note the once rule which got hit by packet other
-already.
+will append '# expired' to note any once rules which have already been hit.
.Pp
.It Cm probability Ar number Ns %
A probability attribute can be attached to a rule,