diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,37 @@
+[![Build Status](https://travis-ci.org/yogsototh/human-readable-duration.svg?branch=master)](https://travis-ci.org/yogsototh/human-readable-duration)
+
+
+[![Hackage](https://img.shields.io/hackage/v/human-readable-duration.svg?maxAge=2592000)](https://hackage.haskell.org/package/human-readable-duration)
+[![human-readable-duration](http://stackage.org/package/human-readable-duration/badge/lts)](http://stackage.org/lts-2/package/human-readable-duration)
+[![human-readable-duration](http://stackage.org/package/human-readable-duration/badge/nightly)](http://stackage.org/lts-2/package/human-readable-duration)
+
+[![Issue Count](https://codeclimate.com/github/yogsototh/human-readable-duration/badges/issue_count.svg)](https://codeclimate.com/github/yogsototh/human-readable-duration)
+
+
+# Human Readable Duration
+
+This is a minimal Haskell library to display duration.
+It is mostly unsafe as it uses only `Int` and `String`s (not even `Text` nor `ByteString`).
+
+## Usage
+
+~~~ {.haskell}
+> import Data.Duration
+> let duration = 2*ms + 3*oneSecond + 2*minute + 33*day + 2*year
+> humanReadableDuration duration
+"2 years 33 days 2 min 3s 2ms"
+> getYears duration
+2
+> getDays duration
+763
+> getMs duration
+65923323002
+~~~
+
+## Install
+
+Install [`stack`](http://github.com/commercialhaskell/stack).
+
+~~~
+stack build
+~~~
diff --git a/human-readable-duration.cabal b/human-readable-duration.cabal
--- a/human-readable-duration.cabal
+++ b/human-readable-duration.cabal
@@ -1,6 +1,6 @@
 cabal-version: >=1.10
 name: human-readable-duration
-version: 0.2.1.1
+version: 0.2.1.2
 license: BSD3
 license-file: LICENSE
 maintainer: yann.esposito@gmail.com
@@ -21,6 +21,9 @@
     > -- will return 65923323002
 category: Time
 build-type: Simple
+extra-source-files:
+    README.md
+    stack.yaml
 
 source-repository head
     type: git
@@ -32,6 +35,8 @@
         Data.Duration.Tutorial
     hs-source-dirs: src
     default-language: Haskell2010
+    ghc-options: -Wall -Wincomplete-uni-patterns
+                 -Wredundant-constraints -Wnoncanonical-monad-instances
     build-depends:
         base >=4.7 && <5
 
diff --git a/src/Data/Duration.hs b/src/Data/Duration.hs
--- a/src/Data/Duration.hs
+++ b/src/Data/Duration.hs
@@ -16,6 +16,7 @@
 module Data.Duration
     ( humanReadableDuration
     , humanReadableDuration'
+    , approximativeDuration
     , Seconds
     -- durations
     , ms
@@ -33,7 +34,7 @@
     , getYears
     ) where
 
-import Data.Fixed (Fixed(..), Micro, div', mod')
+import           Data.Fixed (Fixed (..), Micro, div', mod')
 
 type Seconds = Micro
 
diff --git a/stack.yaml b/stack.yaml
new file mode 100644
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,9 @@
+flags: {}
+packages:
+- '.'
+extra-deps: []
+resolver: lts-13.0
+extra-lib-dirs:
+  - /usr/lib
+  - /usr/local/lib
+  - /usr/local/opt/libiconv/lib