diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2019-04-01/natGateway.json b/specification/network/resource-manager/Microsoft.Network/stable/2019-04-01/natGateway.json
index 30694ee0856f..82ba65ff3b5c 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2019-04-01/natGateway.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2019-04-01/natGateway.json
@@ -394,6 +394,13 @@
           "$ref": "#/definitions/NatGatewayPropertiesFormat",
           "description": "Nat Gateway properties."
         },
+        "zones": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "description": "A list of availability zones denoting the zone in which Nat Gateway should be deployed."
+        },
         "etag": {
           "type": "string",
           "description": "A unique read-only string that changes whenever the resource is updated."