diff --git a/README.md b/README.md
index 1cc29e5..0ab0753 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,23 @@
 # Rfc5849
 
-**TODO: Add description**
+## Introduction
 
+This application was inspired by OAuther and oauth2 libraries from
+Elixir/Erlang.
+
+## Requirement
+
+ * Full oauth/1 implementation (https://tools.ietf.org/html/rfc5849)
+ 
+ * Abstract the client/server exchange method
+ 
+ * Create a damn simple library
+ 
+ * Offer an infrastructure to manage creds
+ 
+ * Connection retention (based on other current http client in
+   elixir/erlang)
+ 
 ## Installation
 
 If [available in Hex](https://hex.pm/docs/publish), the package can be installed
@@ -15,7 +31,48 @@ def deps do
 end
 ```
 
-Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
-and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
-be found at [https://hexdocs.pm/rfc5849](https://hexdocs.pm/rfc5849).
+## Usage
 
+```
+Application.start(Rfc5849)
+{:ok, ref} = Rfc5849.new()
+```
+
+## Structure
+
+Rfc5849 is an OTP application and must be started. This application
+will spawn many processes to manage oauth/1 authentication with remote
+server.
+
+```
+  _____      ____________      ________            _____
+ (_____)    |            |    |        |          (     )
+ | ref |----| supervisor |----| client |-------->( oauth )
+ (_____)    |____________|    |________|          (_____)
+                       |       ________             |
+                       |      |        |            |
+					   +------| server |<-----------+
+                       |      |________|
+					   |	   __________
+                       |      (__________)
+                       +------|          |
+					          | exchange |
+							  (__________)
+
+```
+
+Each user must have an isolated pool of client/server to ensure that
+the confidential information not leak.
+
+```elixir
+{:ok, ref} = Rfc5849.new()
+```
+
+`ref` variable will be used to exchange information with internal
+service and track connection.
+
+## Resources
+
+ * https://tools.ietf.org/html/rfc5849
+ * https://github.com/lexmag/oauther/
+ * https://github.com/scrogson/oauth2
diff --git a/lib/rfc5849.ex b/lib/rfc5849.ex
index 576bb08..679e3e0 100644
--- a/lib/rfc5849.ex
+++ b/lib/rfc5849.ex
@@ -1,11 +1,14 @@
 defmodule Rfc5849 do
   
   @moduledoc """
-  Documentation for Rfc5849.
+  Rfc5849 implement oauth/1 as GenServer OTP behaviour.
+
+  fixed value
+
+
   """
 
   defstruct [
-    realm: nil,
     consumer_key: nil,
     consumer_secret: nil, # must be protected
     token: nil,
@@ -15,13 +18,7 @@ defmodule Rfc5849 do
     signature: nil,
     signature_method: :hmac_sha1,
     timestamp: nil,
-    nonce: nil,
-    client: %{
-      method: nil,
-      headers: nil,
-      params: nil
-    }
-    request: {}
+    nonce: nil
   ]
   
   use GenServer
diff --git a/lib/rfc5849_lib.ex b/lib/rfc5849_lib.ex
index 7fee699..cf0f93c 100644
--- a/lib/rfc5849_lib.ex
+++ b/lib/rfc5849_lib.ex
@@ -142,4 +142,9 @@ defmodule Rfc5849.Lib do
     path = struct.path
     query = struct.query
   end
+  
+  @spec authorization_header(Rfc5849.t()) :: string()
+  def authorization_header (struct) do
+    :ok
+  end
 end
diff --git a/test/rfc5849_lib_test.exs b/test/rfc5849_lib_test.exs
index a07864a..6cffc3d 100644
--- a/test/rfc5849_lib_test.exs
+++ b/test/rfc5849_lib_test.exs
@@ -1,5 +1,7 @@
 defmodule Rfc5849.LibTest do
+  use ExUnit.Case
 
+  
   test "URI" do
     :ok
   end