Update aws.md

I had an issue with DNS not working because i didn't add the "kubernetes.io/cluster/$cluster_name" to the route table my subnets where using.

docs/aws.md

@@ -5,7 +5,7 @@ To deploy kubespray on [AWS](https://aws.amazon.com/) uncomment the `cloud_provi
 
 Prior to creating your instances, you **must** ensure that you have created IAM roles and policies for both "kubernetes-master" and "kubernetes-node". You can find the IAM policies [here](https://github.com/kubernetes-incubator/kubespray/tree/master/contrib/aws_iam/). See the [IAM Documentation](https://aws.amazon.com/documentation/iam/) if guidance is needed on how to set these up. When you bring your instances online, associate them with the respective IAM role. Nodes that are only to be used for Etcd do not need a role.
 
-You would also need to tag the resources in your VPC accordingly for the aws provider to utilize them. Tag the subnets and all instances that kubernetes will be run on with key `kubernetes.io/cluster/$cluster_name` (`$cluster_name` must be a unique identifier for the cluster). Tag the subnets that must be targetted by external ELBs with the key `kubernetes.io/role/elb` and internal ELBs with the key `kubernetes.io/role/internal-elb`.
+You would also need to tag the resources in your VPC accordingly for the aws provider to utilize them. Tag the subnets, route tables and all instances that kubernetes will be run on with key `kubernetes.io/cluster/$cluster_name` (`$cluster_name` must be a unique identifier for the cluster). Tag the subnets that must be targetted by external ELBs with the key `kubernetes.io/role/elb` and internal ELBs with the key `kubernetes.io/role/internal-elb`.
 
 Make sure your VPC has both DNS Hostnames support and Private DNS enabled.