diff --git a/main.tf b/main.tf
index cfd866e..9a608dc 100644
--- a/main.tf
+++ b/main.tf
@@ -27,7 +27,7 @@ locals {
     orchestrator_version = var.kubernetes_version
     vm_size              = "Standard_D2s_v3"
     os_type              = "Linux"
-    # availability_zones   = [1, 2, 3]
+    availability_zones   = null
     enable_auto_scaling  = false
     min_count            = null
     max_count            = null
diff --git a/test/README.md b/test/README.md
index c37b74a..ab95562 100644
--- a/test/README.md
+++ b/test/README.md
@@ -18,6 +18,10 @@ cd test
 
 # Init
 terraform init
+terraform validate
+
+# Plan
+terraform plan
 
 # Apply
 terraform apply