diff --git a/openapi-internal.yaml b/openapi-internal.yaml
index 70da04e..b03e46b 100644
--- a/openapi-internal.yaml
+++ b/openapi-internal.yaml
@@ -61,6 +61,13 @@ paths:
         - Submissions
       parameters:
         - $ref: '#/components/parameters/SubmissionID'
+        - name: StatusMessage
+          in: query
+          required: true
+          schema:
+            type: string
+            minLength: 0
+            maxLength: 4096
       responses:
         "204":
           description: Successful response