diff --git a/Web/Twitter/Conduit.hs b/Web/Twitter/Conduit.hs
--- a/Web/Twitter/Conduit.hs
+++ b/Web/Twitter/Conduit.hs
@@ -1,12 +1,166 @@
+{-# LANGUAGE CPP #-}
+{-# OPTIONS_GHC -fno-warn-unused-imports #-}
+
+-- |
+-- Module:      Web.Twitter.Conduit
+-- Copyright:   (c) 2014 Takahiro Himura
+-- License:     BSD
+-- Maintainer:  Takahiro Himura <taka@himura.jp>
+-- Stability:   experimental
+-- Portability: portable
+--
+-- A client library for Twitter APIs (see <https://dev.twitter.com/>).
+
 module Web.Twitter.Conduit
-       ( module Export
+       (
+       -- * How to use this library
+       -- $howto
+
+       -- * Re-exports
+         module Web.Twitter.Conduit.Base
+       , module Web.Twitter.Conduit.Api
+       , module Web.Twitter.Conduit.Status
+       , module Web.Twitter.Conduit.Monad
+       , module Web.Twitter.Conduit.Stream
+       , module Web.Twitter.Conduit.Request
+       , module Web.Twitter.Conduit.Parameters
+       , module Web.Twitter.Types.Lens
        ) where
 
-import Web.Twitter.Conduit.Base as Export
-import Web.Twitter.Conduit.Api as Export
-import Web.Twitter.Conduit.Status as Export
-import Web.Twitter.Conduit.Monad as Export
-import Web.Twitter.Conduit.Stream as Export
-import Web.Twitter.Conduit.Request as Export
-import Web.Twitter.Conduit.Parameters as Export
-import Web.Twitter.Types.Lens as Export
+import Web.Twitter.Conduit.Base
+import Web.Twitter.Conduit.Api
+import Web.Twitter.Conduit.Status
+import Web.Twitter.Conduit.Monad
+import Web.Twitter.Conduit.Stream
+import Web.Twitter.Conduit.Request
+import Web.Twitter.Conduit.Parameters
+import Web.Twitter.Types.Lens
+
+-- for haddock
+import Web.Authenticate.OAuth
+import Data.Conduit
+import qualified Data.Conduit.List as CL
+import qualified Data.Text as T
+import qualified Data.Text.IO as T
+import Control.Monad.Logger
+import Control.Monad.IO.Class
+import Control.Lens
+
+#ifdef HLINT
+{-# ANN module "HLint: ignore Use import/export shortcut" #-}
+#endif
+
+-- $howto
+--
+-- The main module of twitter-conduit is "Web.Twitter.Conduit".
+-- This library cooperate with <http://hackage.haskell.org/package/twitter-types twitter-types>,
+-- <http://hackage.haskell.org/package/authenticate-oauth authenticate-oauth>,
+-- and <http://hackage.haskell.org/package/conduit conduit>.
+-- All of following examples import modules as below:
+--
+-- > {-# LANGUAGE OverloadedStrings #-}
+-- >
+-- > import Web.Twitter.Conduit
+-- > import Web.Authenticate.OAuth
+-- > import Data.Conduit
+-- > import qualified Data.Conduit.List as CL
+-- > import qualified Data.Text as T
+-- > import qualified Data.Text.IO as T
+-- > import Control.Monad.Logger
+-- > import Control.Monad.IO.Class
+-- > import Control.Lens
+--
+-- First, you should obtain consumer token and secret from <https://apps.twitter.com/ Twitter>,
+-- and prepare 'OAuth' variables as follows:
+--
+-- @
+-- tokens :: 'OAuth'
+-- tokens = 'twitterOAuth'
+--     { 'oauthConsumerKey' = \"YOUR CONSUMER KEY\"
+--     , 'oauthConsumerSecret' = \"YOUR CONSUMER SECRET\"
+--     }
+-- @
+--
+-- Second, you should obtain access token and secret.
+-- You can find examples obtaining those tokens in
+-- <https://github.com/himura/twitter-conduit/blob/master/sample sample directry>,
+-- for instance,
+-- <https://github.com/himura/twitter-conduit/blob/master/sample/oauth_pin.hs oauth_pin.hs>, and
+-- <https://github.com/himura/twitter-conduit/blob/master/sample/oauth_callback.hs oauth_callback.hs>.
+-- If you need more information, see <https://dev.twitter.com/docs/auth/obtaining-access-tokens>.
+--
+-- You should set an access token to 'Credential' variable:
+--
+-- @
+-- credential :: 'Credential'
+-- credential = 'Credential'
+--     [ (\"oauth_token\", \"YOUR ACCESS TOKEN\")
+--     , (\"oauth_token_secret\", \"YOUR ACCESS TOKEN SECRET\")
+--     ]
+-- @
+--
+-- You should also set up the 'TWToken' and 'TWInfo' variables as below:
+--
+-- @
+-- twInfo :: 'TWInfo'
+-- twInfo = 'def'
+--     { 'twToken' = 'def' { 'twOAuth' = tokens, 'twCredential' = credential }
+--     , 'twProxy' = Nothing
+--     }
+-- @
+--
+-- Or, simply as follows:
+--
+-- > twInfo = setCredential tokens credential def
+--
+-- Every twitter API functions are run in the 'TW' monad.
+-- By using 'runTW' function, you can perform computation in 'TW' monad.
+--
+-- Twitter API requests are performed by 'call' function.
+-- For example, <https://dev.twitter.com/docs/api/1.1/get/statuses/home_timeline GET statuses/home_timeline>
+-- could be obtained by:
+--
+-- @
+-- timeline <- 'call' 'homeTimeline'
+-- @
+--
+-- The response of 'call' function is wrapped by the suitable type of
+-- <http://hackage.haskell.org/package/twitter-types twitter-types>.
+-- In this case, /timeline/ has a type of ['Status'].
+-- If you need /raw/ JSON Value which is parsed by <http://hackage.haskell.org/package/aeson aeson>,
+-- use 'call'' to obtain it.
+--
+-- By default, the response of <https://dev.twitter.com/docs/api/1.1/get/statuses/home_timeline GET statuses/home_timeline>
+-- includes 20 tweets, and you can change the number of tweets by the /count/ parameter.
+--
+-- @
+-- timeline <- 'call' '$' 'homeTimeline' '&' 'count' '?~' 200
+-- @
+--
+-- If you need more statuses, you can obtain those with multiple API requests.
+-- This library provides the wrapper for multiple requests with conduit interfaces.
+-- For example, if you intend to fetch the all friends information,
+-- you may perform multiple API requests with changing cursor parameter,
+-- or use the conduit wrapper 'sourceWithCursor' as below:
+--
+-- @
+-- friends <- 'sourceWithCursor' ('friendsList' ('ScreenNameParam' \"thimura\") '&' 'count' '?~' 200) '$$' 'CL.consume'
+-- @
+--
+-- Statuses APIs, for instance, 'homeTimeline', are also wrapped by 'sourceWithMaxId'.
+--
+-- For example, you can print 1000 tweets from your home timeline, as below:
+--
+-- @
+-- main :: IO ()
+-- main = runNoLoggingT . runTW twInfo $ do
+--     'sourceWithMaxId' 'homeTimeline'
+--         $= CL.isolate 60
+--         $$ CL.mapM_ $ \status -> liftIO $ do
+--             T.putStrLn $ T.concat [ T.pack . show $ status ^. statusId
+--                                   , ": "
+--                                   , status ^. statusUser . userScreenName
+--                                   , ": "
+--                                   , status ^. statusText
+--                                   ]
+-- @
diff --git a/Web/Twitter/Conduit/Base.hs b/Web/Twitter/Conduit/Base.hs
--- a/Web/Twitter/Conduit/Base.hs
+++ b/Web/Twitter/Conduit/Base.hs
@@ -14,6 +14,7 @@
        ( api
        , apiRequest
        , call
+       , call'
        , sourceWithMaxId
        , sourceWithCursor
        , TwitterBaseM
diff --git a/Web/Twitter/Conduit/Monad.hs b/Web/Twitter/Conduit/Monad.hs
--- a/Web/Twitter/Conduit/Monad.hs
+++ b/Web/Twitter/Conduit/Monad.hs
@@ -32,14 +32,14 @@
 data TWToken = TWToken
     { twOAuth :: OAuth
     , twCredential :: Credential
-    }
+    } deriving Show
 instance Default TWToken where
     def = TWToken twitterOAuth (Credential [])
 
 data TWInfo = TWInfo
     { twToken :: TWToken
     , twProxy :: Maybe Proxy
-    }
+    } deriving Show
 instance Default TWInfo where
     def = TWInfo
         { twToken = def
diff --git a/twitter-conduit.cabal b/twitter-conduit.cabal
--- a/twitter-conduit.cabal
+++ b/twitter-conduit.cabal
@@ -1,5 +1,5 @@
 name:              twitter-conduit
-version:           0.0.1
+version:           0.0.2
 license:           BSD3
 license-file:      LICENSE
 author:            HATTORI Hiroki, Hideyuki Tanaka, Takahiro HIMURA