   the directory listing for a specific directory, use the file
   system path.
 
-  If a static asset cannot be found, `Plug.Static.Ls`
+  If a static asset directory cannot be found, `Plug.Static.Ls`
   simply forwards the connection to the rest of the pipeline.
 
   ## Options

      or "/favicon-high.ico". Such matches are useful when serving
      digested files at the root. Defaults to `nil` (no filtering).

    * `:headers` - other headers to be set when serving static assets.

  ## Acknowledgment

  The source code is derived from `Plug.Static` module.

    from = Keyword.fetch!(opts, :from)
    only = Keyword.get(opts, :only, [])
    prefix = Keyword.get(opts, :only_matching, [])

    from =
      case from do
