Update k8s netpol docs

- Mention `--use-legacy-netpol` flag.
- Link to NetworkPolicy from 1.7.

site/kubernetes/kube-addon.md

@@ -156,7 +156,7 @@ labels. For more information on configuring network policies in
 Kubernetes see the
 [walkthrough](http://kubernetes.io/docs/getting-started-guides/network-policy/walkthrough/)
 and the [NetworkPolicy API object
-definition](http://kubernetes.io/docs/api-reference/extensions/v1beta1/definitions/#_v1beta1_networkpolicy).
+definition](https://v1-7.docs.kubernetes.io/docs/api-reference/v1.7/#networkpolicy-v1-networking)
 
 **Note:** as of version 1.9 of Weave Net, the Network Policy
   Controller allows all multicast traffic. Since a single multicast
@@ -299,6 +299,7 @@ You can customise the YAML you get from `cloud.weave.works` by passing some of W
   - `disable-npc`: boolean (`true|false`). Default: `false`.
   - `env.NAME=VALUE`: add environment variable `NAME` and set it to `VALUE`.
   - `seLinuxOptions.NAME=VALUE`: add SELinux option `NAME` and set it to `VALUE`, e.g. `seLinuxOptions.type=spc_t`
+  - `use-legacy-netpol`: use [legacy NetworkPolicy semantics](https://v1-7.docs.kubernetes.io/docs/api-reference/v1.7/#networkpolicy-v1-networking), boolean (`true|false`). Default: `true` for Kubernetes version <= 1.6, `false` for > 1.6.
 
 The list of variables you can set is: