diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/expressRouteCircuit.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/expressRouteCircuit.json
index fb6483f0357d..94be802019aa 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/expressRouteCircuit.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/expressRouteCircuit.json
@@ -1595,10 +1595,11 @@
         },
         "tier": {
           "type": "string",
-          "description": "The tier of the SKU. Possible values are 'Standard' and 'Premium'.",
+          "description": "The tier of the SKU. Possible values are 'Standard', 'Premium' or 'Basic'.",
           "enum": [
             "Standard",
-            "Premium"
+            "Premium",
+            "Basic"
           ],
           "x-ms-enum": {
             "name": "ExpressRouteCircuitSkuTier",