diff --git a/neurostore-openapi.yml b/neurostore-openapi.yml
index 9a074b6..b0e9f55 100644
--- a/neurostore-openapi.yml
+++ b/neurostore-openapi.yml
@@ -1195,6 +1195,7 @@ components:
           type: object
           x-stoplight:
             id: wibxycovy2j3g
+          nullable: true
     analysis-return:
       title: analysis-return
       allOf: