Document authpf's requirement for a mounted fdescfs(5).

PR:		docs/89635
MFC after:	1 day

contrib/pf/authpf/authpf.8

@@ -1,3 +1,4 @@
+.\" $FreeBSD$
 .\" $OpenBSD: authpf.8,v 1.38 2005/01/04 09:57:04 jmc Exp $
 .\"
 .\" Copyright (c) 2002 Bob Beck (beck@openbsd.org>.  All rights reserved.
@@ -24,7 +25,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd January 10, 2002
+.Dd March 28, 2006
 .Dt AUTHPF 8
 .Os
 .Sh NAME
@@ -59,7 +60,11 @@ can add filter and translation rules using the syntax described in
 .Nm
 requires that the
 .Xr pf 4
-system be enabled before use.
+system be enabled and a 
+.Xr fdescfs 5
+file system be mounted at
+.Pa /dev/fd
+before use.
 .Nm
 can also maintain the list of IP address of connected users
 in the "authpf_users"
@@ -516,6 +521,7 @@ rdr-anchor "authpf/*" from <authpf_users>
 .Sh SEE ALSO
 .Xr pf 4 ,
 .Xr pf.conf 5 ,
+.Xr fdescfs 5 ,
 .Xr ftp-proxy 8
 .Sh HISTORY
 The