Does not autogenerates after changing entity

Sorry guys, maybe I missed something important in the docs.

As I understood I should just add gem to a Gemfile, then add add_swagger_documentation method to my API class which is Grape::API inherited, and then MAGIC, it should autogenerate swagger.json file.

I've received legacy project with grape-swagger, grape-swagger-representable, grape-swagger-representable and rswag-ui gems and configuration.

Everything works fine until I change entities.

swagger.json is without any changes...

I didn't find how can I regenerated this file.

Could you please tell me, what should I do to get swagger.json updated.

class API::V4 < Grape::API
  # ...
   add_swagger_documentation(
      base_path: '/api',
      api_version: 'v4',
      hide_documentation_path: true,  
      doc_version: '4',
      api_key: 'something:something',
      mount_path: '/swagger_doc',
      security_definitions: {
           Authorization: {
               type: 'apiKey',
               name: 'Authorization',      
               in: 'header'
           }
       }
  )
end

Read the Gemfile and the API::V4 add_swagger_documentation entry point, then determine how swagger.json is generated and whether entity changes are reflected automatically. Document the exact regeneration workflow and clarify what users should do to update the file.