Question about Capistrano file

In this link http://railscasts.com/episodes/133-capistrano-tasks

It shows what would be call capistrano.txt that you have to modify. It
shows

Directory Structure

  myapp/releases
  myapp/current -> releases/20081019001122
  myapp/shared

cap deploy

  deploy:update_code
  deploy:symlink_shared
  deploy:symlink
  deploy:restart

I can't find this file for the life of me. I've deployed without
touching this files but It has to be somewhere. Anyone know where I find
this file?

You want config/deploy.rb.