Document forward(1) better.

PR:		docs/10126
Submitted by:	Sue Blake <sue@welearn.com.au>

share/man/man5/forward.5

@@ -29,7 +29,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$Id$
+.\"	$Id: forward.5,v 1.2 1997/03/07 03:28:00 jmg Exp $
 .\"
 .Dd July 2, 1996
 .Dt FORWARD 5
@@ -67,6 +67,22 @@ and to the program
 .Pa /usr/bin/vacation
 with the single argument
 .Ar nobody .
+.Pp
+If a local user address is prefixed with a backslash
+character, mail is delivered directly to the user's
+mail spool file, bypassing further redirection.
+.Pp
+For example, if user chris had a 
+.Nm .forward
+file containing the following lines:
+.Bd -literal -offset indent
+chris@otherhost
+\echris
+.Ed
+.Pp
+One copy of mail would be forwarded to 
+.Ar chris@otherhost
+and another copy would be retained as mail for local user chris.
 
 .Sh FILES
 .Bl -tag -width $HOME/.forward -compact
@@ -75,5 +91,6 @@ with the single argument
 The user's forwarding instructions.
 .El
 .Sh SEE ALSO
+.Xr aliases 5 ,
 .Xr mailaddr 7 ,
 .Xr sendmail 8