diff --git a/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2022-05-01/machineLearningServices.json b/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2022-05-01/machineLearningServices.json
index 6f92e56d6eb6..2ae9a36100dc 100644
--- a/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2022-05-01/machineLearningServices.json
+++ b/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/stable/2022-05-01/machineLearningServices.json
@@ -2204,6 +2204,11 @@
           "description": "The URI associated with this workspace that machine learning flow must point at to set up tracking.",
           "type": "string",
           "readOnly": true
+        },
+        "v1LegacyMode": {
+          "description": "Enabling v1_legacy_mode may prevent you from using features provided by the v2 API.",
+          "default": false,
+          "type": "boolean"
         }
       }
     },