diff --git a/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2019-11-01/costmanagement.json b/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2019-11-01/costmanagement.json
index 8a62002e0d69..609162e99b4c 100644
--- a/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2019-11-01/costmanagement.json
+++ b/specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2019-11-01/costmanagement.json
@@ -1518,7 +1518,8 @@
       "properties": {
         "name": {
           "description": "The name of the column to use in comparison.",
-          "type": "string"
+          "type": "string",
+          "x-nullable": true
         },
         "operator": {
           "description": "The operator to use for comparison.",