diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,20 +1,19 @@
-Copyright (c) 2014 Wei En
+Copyright (c) 2014 Ng Wei En
 
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Software.
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/counter.cabal b/counter.cabal
--- a/counter.cabal
+++ b/counter.cabal
@@ -1,5 +1,5 @@
 name:          counter
-version:       0.1.0.0
+version:       0.1.0.1
 synopsis:      An object frequency counter.
 description:   This project provides an efficient object frequency counter, based upon Data.Map.Strict.
 homepage:      https://github.com/wei2912/counter
@@ -16,8 +16,8 @@
 cabal-version: >=1.10
 
 library
-  exposed-modules:   Data.Counter
-  build-depends:     base >=4.7 && <4.8,
+  build-depends:     base >=4.8 && <4.9,
                      containers >=0.5 && <0.6
+  exposed-modules:   Data.Counter
   hs-source-dirs:    src 
   default-language:  Haskell2010
diff --git a/src/Data/Counter.hs b/src/Data/Counter.hs
--- a/src/Data/Counter.hs
+++ b/src/Data/Counter.hs
@@ -20,7 +20,7 @@
   instance of a key.
 -}
 singleton ::
-	Num v
+    Num v
     => k -- ^ Key to be inserted.
     -> Counter k v -- ^ New counter.
 singleton k = M.singleton k 1
@@ -30,38 +30,38 @@
   with a specified value.
 -}
 updateWith ::
-	(Ord k, Num v)
-	=> k -- ^ Key to be inserted.
-	-> v -- ^ Specified frequency count.
-	-> Counter k v -- ^ Old counter.
-	-> Counter k v -- ^ New counter.
+    (Ord k, Num v)
+    => k -- ^ Key to be inserted.
+    -> v -- ^ Specified frequency count.
+    -> Counter k v -- ^ Old counter.
+    -> Counter k v -- ^ New counter.
 updateWith = M.insertWith (+)
 
 {-|
   Increment the frequency count of a key by 1.
 -}
 update ::
-	(Ord k, Num v)
-	=> k -- ^ Key to be inserted.
-	-> Counter k v -- ^ Old counter.
-	-> Counter k v -- ^ New counter.
+    (Ord k, Num v)
+    => k -- ^ Key to be inserted.
+    -> Counter k v -- ^ Old counter.
+    -> Counter k v -- ^ New counter.
 update k = updateWith k 1
 
 {-|
   Convert a list of items into a counter.
 -}
 count ::
-	(Ord k, Num v)
-	=> [k] -- ^ List of keys.
-	-> Counter k v -- ^ New counter.
+    (Ord k, Num v)
+    => [k] -- ^ List of keys.
+    -> Counter k v -- ^ New counter.
 count = L.foldl' (flip update) M.empty
 
 {-|
   Returns the union of two counters.
 -}
 union ::
-	(Ord k, Num v)
-	=> Counter k v -- ^ First counter.
-	-> Counter k v -- ^ Second counter.
-	-> Counter k v -- ^ Union of both counters.
+    (Ord k, Num v)
+    => Counter k v -- ^ First counter.
+    -> Counter k v -- ^ Second counter.
+    -> Counter k v -- ^ Union of both counters.
 union = M.unionWith (+)