diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2018-07-01/virtualNetwork.json b/specification/network/resource-manager/Microsoft.Network/stable/2018-07-01/virtualNetwork.json
index c243e1712f6a..fd057bf6f49e 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2018-07-01/virtualNetwork.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2018-07-01/virtualNetwork.json
@@ -866,6 +866,13 @@
           "type": "string",
           "description": "The address prefix for the subnet."
         },
+        "addressPrefixes": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "description": "List of  address prefixes for the subnet."
+        },
         "networkSecurityGroup": {
           "$ref": "./networkSecurityGroup.json#/definitions/NetworkSecurityGroup",
           "description": "The reference of the NetworkSecurityGroup resource."