diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-04-02-preview/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-04-02-preview/managedClusters.json
index 5e481fb25018..75722c9e1c70 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-04-02-preview/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-04-02-preview/managedClusters.json
@@ -3343,6 +3343,10 @@
           "$ref": "#/definitions/NetworkPlugin",
           "description": "Network plugin used for building the Kubernetes network."
         },
+        "networkPluginMode": {
+          "$ref": "#/definitions/NetworkPluginMode",
+          "description": "Network plugin mode used for building the Kubernetes network."
+        },
         "networkPolicy": {
           "$ref": "#/definitions/NetworkPolicy",
           "description": "Network policy used for building the Kubernetes network."
@@ -6040,6 +6044,10 @@
           "$ref": "#/definitions/NetworkPlugin",
           "description": "networkPlugin for managed cluster snapshot."
         },
+        "networkPluginMode": {
+          "$ref": "#/definitions/NetworkPluginMode",
+          "description": "networkPluginMode for managed cluster snapshot."
+        },
         "networkPolicy": {
           "$ref": "#/definitions/NetworkPolicy",
           "description": "networkPolicy for managed cluster snapshot."
@@ -6083,6 +6091,23 @@
       },
       "description": "Network plugin used for building the Kubernetes network."
     },
+    "NetworkPluginMode": {
+      "type": "string",
+      "enum": [
+        "Overlay"
+      ],
+      "x-ms-enum": {
+        "name": "networkPluginMode",
+        "modelAsString": true,
+        "values": [
+          {
+            "value": "Overlay",
+            "description": "Pods are given IPs from the PodCIDR address space but use Azure Routing Domains rather than Kubenet reference plugins host-local and bridge."
+          }
+        ]
+      },
+      "description": "The mode the network plugin should use."
+    },
     "NetworkPolicy": {
       "type": "string",
       "enum": [