diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2018-08-01-preview/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2018-08-01-preview/managedClusters.json
index c49e0b0eaa01..5adb58d75a3d 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2018-08-01-preview/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2018-08-01-preview/managedClusters.json
@@ -1353,6 +1353,13 @@
         "aadProfile": {
           "$ref": "#/definitions/ManagedClusterAADProfile",
           "description": "Profile of Azure Active Directory configuration."
+        },
+        "apiServerAuthorizedIPRanges": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "description": "Authorized IP Ranges to kubernetes API server."
         }
       },
       "description": "Properties of the managed cluster."
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2018-03-31/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2018-03-31/managedClusters.json
index b12567ed2abf..059e26841e31 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2018-03-31/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2018-03-31/managedClusters.json
@@ -1315,6 +1315,13 @@
         "aadProfile": {
           "$ref": "#/definitions/ManagedClusterAADProfile",
           "description": "Profile of Azure Active Directory configuration."
+        },
+        "apiServerAuthorizedIPRanges": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "description": "Authorized IP Ranges to kubernetes API server."
         }
       },
       "description": "Properties of the managed cluster."