diff --git a/lib/auto_linker.ex b/lib/auto_linker.ex
index 7cf24fb..1678131 100644
--- a/lib/auto_linker.ex
+++ b/lib/auto_linker.ex
@@ -1,27 +1,43 @@
 defmodule AutoLinker do
   @moduledoc """
-  Documentation for AutoLinker.
+  Create url links from text containing urls.
+
+  Turns an input string like `"Check out google.com"` into
+  `Check out `"<a href='http://google.com' target='_blank' rel='noopener noreferrer'>google.com</a>"`
+
+  ## Examples
+
+      iex> AutoLinker.link("google.com")
+      "<a href='http://google.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>google.com</a>"
+
+      iex> AutoLinker.link("google.com", new_window: false, rel: false)
+      "<a href='http://google.com' class='auto-linker'>google.com</a>"
+
+      iex> AutoLinker.link("google.com", new_window: false, rel: false, class: false)
+      "<a href='http://google.com'>google.com</a>"
   """
 
+  @doc """
+  Auto link a string.
+  """
   def link(text, opts \\ []) do
     opts =
-      :url_linker
+      :auto_linker
       |> Application.get_all_env()
       |> Keyword.merge(opts)
 
-    # rel = opts[:rel] || "noopener noreferrer"
-    # new_window if opts[:target]
+    parse text, opts
   end
 
   # state = {buffer, acc, state}
   defp parse(text, opts) do
-    parse(text, Keyword.get(opts, :scheme, false), {"", "", false})
+    parse(text, Keyword.get(opts, :scheme, false), opts, {"", "", false})
   end
 
-  defp parse("", _scheme, opts ,{_, acc, _}), do: acc
+  defp parse("", _scheme, _opts ,{_, acc, _}), do: acc
 
   defp parse(text, scheme, opts, {buffer, acc, state}) do
-    acc <> create_link(text, opts)
+    acc = acc <> create_link(text, opts)
     parse("", scheme, opts, {buffer, acc, state})
   end
 
@@ -29,8 +45,9 @@ defmodule AutoLinker do
     []
     |> build_attrs(url, opts, :rel)
     |> build_attrs(url, opts, :target)
+    |> build_attrs(url, opts, :class)
     |> build_attrs(url, opts, :scheme)
-    |> build_url(url, opts)
+    |> format_url(url, opts)
   end
 
   defp build_attrs(attrs, _, opts, :rel) do
@@ -41,7 +58,11 @@ defmodule AutoLinker do
     if Keyword.get(opts, :new_window, true),
       do: [{:target, :_blank} | attrs], else: attrs
   end
-  defp build_attrs(attrs, url, opts, :scheme) do
+  defp build_attrs(attrs, _, opts, :class) do
+    if cls = Keyword.get(opts, :class, "auto-linker"),
+      do: [{:class, cls} | attrs], else: attrs
+  end
+  defp build_attrs(attrs, url, _opts, :scheme) do
     if String.starts_with?(url, ["http://", "https://"]),
       do: [{:href, url} | attrs], else: [{:href, "http://" <> url} | attrs]
   end
diff --git a/test/auto_linker_test.exs b/test/auto_linker_test.exs
index c4928c3..15dd8a4 100644
--- a/test/auto_linker_test.exs
+++ b/test/auto_linker_test.exs
@@ -2,7 +2,5 @@ defmodule AutoLinkerTest do
   use ExUnit.Case
   doctest AutoLinker
 
-  test "the truth" do
-    assert 1 + 1 == 2
-  end
+
 end