diff --git a/README.md b/README.md
index fee786f..7235f6c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
 # hetzner-cluster
 
-Create a private Kubernetes cluster on Hetzner Cloud.
\ No newline at end of file
+Create a private Kubernetes cluster on Hetzner Cloud.
+
+## Resources
+
+<https://community.hetzner.com/tutorials/kubernetes-on-hetzner-with-crio-flannel-and-hetzner-balancer>
+
+<https://community.hetzner.com/tutorials/how-to-set-up-nat-for-cloud-networks>
diff --git a/terraform/variables.tf b/terraform/variables.tf
index 83fb9e2..54ad85d 100644
--- a/terraform/variables.tf
+++ b/terraform/variables.tf
@@ -4,8 +4,9 @@ locals {
 
   nat-private-ip = "10.0.2.8"
   servers = {
-    node-a = "10.0.2.9"
-    node-b = "10.0.2.10"
+    control = "10.0.2.11"
+    node-a  = "10.0.2.9"
+    node-b  = "10.0.2.10"
   }
 }