add link to cluster addons README

docs/dns.md

 # DNS Integration with Kubernetes
 
-As of kubernetes 0.8, DNS is offered as a cluster add-on.  If enabled, a DNS
-Pod and Service will be scheduled on the cluster, and the kubelets will be
+As of kubernetes 0.8, DNS is offered as a [cluster add-on](../cluster/addons/README.md).
+If enabled, a DNS Pod and Service will be scheduled on the cluster, and the kubelets will be
 configured to tell individual containers to use the DNS Service's IP.
 
 Every Service defined in the cluster (including the DNS server itself) will be
@@ -35,7 +35,7 @@ time.
 
 ## For more information
 
-See [the docs for the cluster addon](../cluster/addons/dns/README.md).
+See [the docs for the DNS cluster addon](../cluster/addons/dns/README.md).
 
 
 [![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/docs/dns.md?pixel)]()