Suggested steps:

  1. Click the API header link
    The API Link link in the header will take you to the API help section for your site. This demo shows the basic ValuesController added when you create a new site using File / New Project / ASP.NET MVC 4 / Web API..
  2. Compare the generated help with the ValuesController methods
    You'll notice that this help documentation exactly parallels the methods, parameters, expected input, and output for each method. This help is generated at runtime, so deleting an action will automatically result in that method being removed from the generated help page.
  3. Customizing the generated help pages
    These help pages are generated at runtime and are completely customizable. See this tutorial for more information.