   Note that since the compiler also defines some additional metadata,
   there are a few reserved keys that will be ignored and warned if used.
   Currently these are: `:opaque` and `:defaults`.
+
+  Once this module is compiled, this information becomes available via
+  the `Code.fetch_docs/1` function.
 
   ### `@dialyzer`
 


  Accepts a string (often a heredoc) or `false` where `@doc false` will
  make the entity invisible to documentation extraction tools like
  ExDoc. For example:

      defmodule MyModule do
        @typedoc "This type"


  As can be seen in the example above, `@doc` and `@typedoc` also accept
  a keyword list that serves as a way to provide arbitrary metadata
  about the entity. Tools like [`ExDoc`](https://hexdocs.pm/ex_doc/)
  and `IEx` may use this information to
  display annotations. A common use case is `since` that may be used
  to annotate in which version the function was introduced.

