title: How to document websocket events or callback in swagger
body: <p>I have a setup where it is possible to get some resource using standard REST and this is easy documented in swagger. The same resource is pushed to clients using websockets when it has changed, so clients does not have to do a pull on an interval basis.</p>
  
  <p>But how can I document this in swagger? Is it even possible? If not, what other tool do you recommend for documenting both the REST api and the websocket part?</p>