diff --git a/specification/iotcentral/resource-manager/Microsoft.IoTCentral/stable/2018-09-01/iotcentral.json b/specification/iotcentral/resource-manager/Microsoft.IoTCentral/stable/2018-09-01/iotcentral.json
index 8958ac279f14..f7887e217709 100644
--- a/specification/iotcentral/resource-manager/Microsoft.IoTCentral/stable/2018-09-01/iotcentral.json
+++ b/specification/iotcentral/resource-manager/Microsoft.IoTCentral/stable/2018-09-01/iotcentral.json
@@ -574,6 +574,10 @@
             "type": "string"
           }
         },
+        "sku": {
+          "description": "A valid instance SKU.",
+          "$ref": "#/definitions/AppSkuInfo"
+        },
         "properties": {
           "description": "The common properties of an IoT Central application.",
           "x-ms-client-flatten": true,