diff --git a/inventory/group_vars/all.yml b/inventory/group_vars/all.yml
index dc8a169e4..14ffa22f3 100644
--- a/inventory/group_vars/all.yml
+++ b/inventory/group_vars/all.yml
@@ -150,6 +150,7 @@ dns_server: "{{ kube_service_addresses|ipaddr('net')|ipaddr(2)|ipaddr('address')
 #azure_subnet_name:
 #azure_security_group_name:
 #azure_vnet_name:
+#azure_route_table_name:
 
 
 ## Set these proxy values in order to update docker daemon to use proxies
diff --git a/roles/kubernetes/preinstall/tasks/azure-credential-check.yml b/roles/kubernetes/preinstall/tasks/azure-credential-check.yml
index 2ee57202b..ca50d5843 100644
--- a/roles/kubernetes/preinstall/tasks/azure-credential-check.yml
+++ b/roles/kubernetes/preinstall/tasks/azure-credential-check.yml
@@ -44,4 +44,9 @@
     msg: "azure_vnet_name is missing"
   when: azure_vnet_name is not defined or azure_vnet_name == ""
 
+- name: check azure_route_table_name value
+  fail:
+    msg: "azure_route_table_name is missing"
+  when: azure_route_table_name is not defined or azure_route_table_name == ""
+