diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2022-01-01-preview/appplatform.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2022-01-01-preview/appplatform.json
index e2f28e8d03fc..f49194203362 100644
--- a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2022-01-01-preview/appplatform.json
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2022-01-01-preview/appplatform.json
@@ -8909,6 +8909,18 @@
           "$ref": "#/definitions/OperationDisplay",
           "description": "Display of the operation"
         },
+        "actionType": {
+          "description": "Enum. Indicates the action type. \"Internal\" refers to actions that are for internal only APIs.",
+          "type": "string",
+          "readOnly": true,
+          "enum": [
+            "Internal"
+          ],
+          "x-ms-enum": {
+            "name": "ActionType",
+            "modelAsString": true
+          }
+        },
         "origin": {
           "description": "Origin of the operation",
           "type": "string"