To generate documentation in HTML format from @doc and @moduledoc attributes in your source code, add ex_doc and a markdown processor, right now ExDoc supports Earmark, Pandoc, Hoedown and Cmark, as dependencies into your mix.exs file:

# config/mix.exs

def deps do
  [{:ex_doc, "~> 0.11", only: :dev},
   {:earmark, "~> 0.1", only: :dev}]
end

If you want to use another Markdown processor, you can find more information in the Changing the Markdown tool section.

You can use Markdown within Elixir @doc and @moduledoc attributes.

Then, run mix docs.

One thing to keep in mind is that ExDoc allows configuration parameters, such as:

  def project do
    [app: :my_app,
     version: "0.1.0-dev",
     name: "My App",
     source_url: "https://github.com/USER/APP",
     homepage_url: "http://YOUR_PROJECT_HOMEPAGE",
     deps: deps(),
     docs: [logo: "path/to/logo.png",
            output: "docs",
            main: "README",
            extra_section: "GUIDES",
            extras: ["README.md", "CONTRIBUTING.md"]]]
  end

You can see more information about this configuration options with mix help docs