diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # state-codes
 
 [![Build Status](https://travis-ci.org/acamino/state-codes.svg?branch=master)](https://travis-ci.org/acamino/state-codes)
+[![Hackage version](https://img.shields.io/hackage/v/state-codes.svg)](http://hackage.haskell.org/package/state-codes)
 
 This package provides the ISO 3166-2:US state codes and i18n names.
 This work is entirely based on the package [Data.CountryCodes](http://hackage.haskell.org/package/country-codes).
diff --git a/src/Data/StateCodes.hs b/src/Data/StateCodes.hs
--- a/src/Data/StateCodes.hs
+++ b/src/Data/StateCodes.hs
@@ -1,4 +1,5 @@
--- | Main entry point.
+-- | This module defines codes for the names of the principal subdivisions for
+-- the United States according to ISO 3166-2:US.
 
 module Data.StateCodes
   ( StateCode(..)
diff --git a/src/Data/StateCodes/ISO31662US.hs b/src/Data/StateCodes/ISO31662US.hs
--- a/src/Data/StateCodes/ISO31662US.hs
+++ b/src/Data/StateCodes/ISO31662US.hs
@@ -1,10 +1,11 @@
--- | This module defines codes for the names of the principal subdivisions for
--- the United States according to ISO 3166-2:US
--- <https://en.wikipedia.org/wiki/ISO_3166-2:US>.
+-- The information used in this module was pulled from the @Wikipedia article
+-- about ISO_3166-2:US@: <https://en.wikipedia.org/wiki/ISO_3166-2:US>.
 
+{-# LANGUAGE DeriveDataTypeable    #-}
 {-# LANGUAGE FlexibleInstances     #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings     #-}
+-- Only if version 7.8
 {-# LANGUAGE PatternGuards         #-}
 
 module Data.StateCodes.ISO31662US
@@ -88,7 +89,7 @@
                deriving (Bounded, Eq, Enum, Show, Read, Ord, Typeable)
 
 
--- | Maybe get the state code from the text code.
+-- | Maybe get the state code from the text code
 
 fromMText :: Text -> Maybe StateCode
 fromMText "AL" = Just AL
diff --git a/state-codes.cabal b/state-codes.cabal
--- a/state-codes.cabal
+++ b/state-codes.cabal
@@ -1,5 +1,5 @@
 name:                state-codes
-version:             0.1.1
+version:             0.1.2
 synopsis:            ISO 3166-2:US state codes and i18n names
 description:         This package provides the ISO 3166-2:US state codes and i18n names
 homepage:            https://github.com/acamino/state-codes#README