EJ

Where did you see this will work? I believe you should set the version in your Grape api using the [`path`](https://github.com/ruby-grape/grape-swagger/blob/9462b51f968a96150773e1b5a545761d31977b88/spec/swagger_v2/endpoint_versioned_path_spec.rb#L8) method, and then do `add_swagger_documentation add_version`.

Was looking at your branch. Can you explain more what the async validator is supposed to look like? And why did you say it's not working?