Tweak docs related to use of 0.0.0.0

DOC/CLUSTER_MGMT.md

@@ -35,7 +35,7 @@ _When restarting a node, there is no further need to pass `-join`. It will be ig
 You've now got a fault-tolerant, distributed, relational database. It can tolerate the failure of any node, even the leader, and remain operational.
 
 ## Listening on all interfaces
-You can pass `0.0.0.0` to both `-http-addr` and `-raft-addr` if you wish a node to listen on all interfaces. You must still pass an explicit network address to `-join` however.
+You can pass `0.0.0.0` to both `-http-addr` and `-raft-addr` if you wish a node to listen on all interfaces. You must still pass an explicit network address to `-join` however. In this case you'll also want to set `-http-adv-addr` to the actual interface address, so other nodes learn the correct network address to use to reach the node listening on `0.0.0.0`.
 
 ## Discovery Service
 There is also a rqlite _Discovery Service_, allowing nodes to automatically connect and form a cluster. This can be much more convenient, allowing clusters to be dynamically created. Check out [the documentation](https://github.com/rqlite/rqlite/blob/master/DOC/DISCOVERY.md) for more details.