diff --git a/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2021-07-01/machineLearningServices.json b/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2021-07-01/machineLearningServices.json
index a6981e3c77b2..d3e8fd8b7330 100644
--- a/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2021-07-01/machineLearningServices.json
+++ b/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2021-07-01/machineLearningServices.json
@@ -3273,11 +3273,13 @@
       "properties": {
         "relayConnectionString": {
           "description": "Relay connection string.",
-          "type": "string"
+          "type": "string",
+          "x-ms-secret": true
         },
         "serviceBusConnectionString": {
           "description": "ServiceBus connection string.",
-          "type": "string"
+          "type": "string",
+          "x-ms-secret": true
         },
         "extensionPrincipalId": {
           "description": "Extension principal-id.",