diff --git a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json
index 10aa718482e9..3c3f7fc82dc9 100644
--- a/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json
+++ b/specification/web/resource-manager/Microsoft.Web/stable/2018-02-01/WebApps.json
@@ -17213,6 +17213,10 @@
             "storageAccountUrl"
           ],
           "properties": {
+            "backupName": {
+              "description": "Name of the backup.",
+              "type": "string"
+            },
             "enabled": {
               "description": "True if the backup schedule is enabled (must be included in that case), false if the backup schedule should be disabled.",
               "type": "boolean"