How do I create a title for the apipie-rails gem?

I need to create an API with apipie-rails, but I want to create documentation for headers like this "X-User-Email" or "X-User-Token".

I have a description of this resource:

resource_description do
   short 'Cars'
   formats ['json']
   param 'X-User-Email <X-User-Email>', String, :desc => "HEADER param: Email must correspond to TOKEN owner", :required => false
   param 'X-User-Token <X-User-Token>', String, :desc => "HEADER param: Token must correspond to EMAIL owner", :required => false
   error :code => 401, :desc => "Unauthorized - Returned when authentication can't be achieved via login or missing/expired api token"
end

      

        
        
        
      

    

But the argument param

doesn't help me in this case.

Is it possible?