diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/examples/VirtualNetworkCheckIPAddressAvailability.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/examples/VirtualNetworkCheckIPAddressAvailability.json
index 1259b47e9141..534b785b8133 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/examples/VirtualNetworkCheckIPAddressAvailability.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/examples/VirtualNetworkCheckIPAddressAvailability.json
@@ -4,7 +4,7 @@
     "subscriptionId" : "subid",
     "resourceGroupName" : "rg1",
     "virtualNetworkName" : "test-vnet",
-    "IPAddress": "10.0.1.4"
+    "ipAddress": "10.0.1.4"
   },
   "responses" : {
     "200" : {
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/virtualNetwork.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/virtualNetwork.json
index 477ec20ee203..43bd4a45dc6b 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/virtualNetwork.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-08-01/virtualNetwork.json
@@ -742,7 +742,7 @@
           {
             "name": "ipAddress",
             "in": "query",
-            "required": false,
+            "required": true,
             "type": "string",
             "description": "The private IP address to be verified."
           },