Document adding a route on non-Weave hosts

site/using-weave/host-network-integration.md

@@ -38,6 +38,20 @@ Exposed addresses can also be added to weaveDNS by supplying fully qualified dom
     host2$ weave expose -h exposed.weave.local
     10.2.1.132
 
+###<a name="routing"></a>Routing from another host
+
+Having run `weave expose` as above, you can use Linux routing to give
+access to the Weave Network from hosts that are not running Weave Net:
+
+    ip route add <network-cidr> via <exposing-host>
+
+Where `<network-cidr>` is an IP address range in use on Weave Net,
+e.g. `10.2.0.0/16` or `10.32.0.0/12` and `<exposing-host>` is the
+address of the machine where you ran `weave expose`.
+
+>**Note:** You must ensure that the [IP subnet](site/how-it-works/ip-addresses.md)
+used by Weave Net does not clash with anything on those other hosts.
+
 
 **See Also**