diff --git a/lib/ansible/modules/cloud/azure/azure_rm_aks.py b/lib/ansible/modules/cloud/azure/azure_rm_aks.py
index ef49340052e..ad509db340e 100644
--- a/lib/ansible/modules/cloud/azure/azure_rm_aks.py
+++ b/lib/ansible/modules/cloud/azure/azure_rm_aks.py
@@ -74,6 +74,9 @@ options:
                 description:
                     - The VM Size of each of the Agent Pool VM's (e.g. C(Standard_F1) / C(Standard_D2v2)).
                 required: true
+            vnet_subnet_id:
+                description:
+                    - Id of subnet for Agent Pool VM's Network Interfaces
             os_disk_size_gb:
                 description:
                     - Size of the OS disk.