diff --git a/share/man/man4/mac_portacl.4 b/share/man/man4/mac_portacl.4
index 9aa74917812..a7de4ab01b3 100644
--- a/share/man/man4/mac_portacl.4
+++ b/share/man/man4/mac_portacl.4
@@ -30,7 +30,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 13, 2004
+.Dd December 8, 2004
 .Dt MAC_PORTACL 4
 .Os
 .Sh NAME
@@ -207,10 +207,13 @@ explicitly allow this.
 Allow applications to use automatic binding to port 0.
 Often applications will use port 0 as a request for
 automatic port allocation before binding an IP address to
-a socket.  This tunable will exempt port 0 allocation from
-rule checking when a low port is required and
+a socket.
+This tunable will exempt port 0 allocation from
+rule checking when a low port will not be used.
+For this to perform as expected,
 .Dv IP_PORTRANGELOW
-is set to a value above 1.
+is must not be set as it is used to request a
+low port.
 .El
 .Sh SEE ALSO
 .Xr mac 3 ,