diff --git a/specification/mixedreality/resource-manager/Microsoft.MixedReality/preview/2019-02-28-preview/mixedreality.json b/specification/mixedreality/resource-manager/Microsoft.MixedReality/preview/2019-02-28-preview/mixedreality.json
index 4f3bb99ba26d..986cd9ea4dd9 100644
--- a/specification/mixedreality/resource-manager/Microsoft.MixedReality/preview/2019-02-28-preview/mixedreality.json
+++ b/specification/mixedreality/resource-manager/Microsoft.MixedReality/preview/2019-02-28-preview/mixedreality.json
@@ -535,6 +535,10 @@
         "isDataAction": {
           "description": "Whether or not this is a data plane operation",
           "type": "boolean"
+        },
+        "origin": {
+          "description": "The origin for the operation",
+          "type": "string"
         }
       }
     },