diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 
 * This module provides simple functions used to print values in tabular format
 * Version 0.1.0
-* Contributes and Bug Reports Welcome
+* Contributions and Bug Reports welcome. Please use the Github issue tracker.
 
 ### Examples ###
 
diff --git a/pptable.cabal b/pptable.cabal
--- a/pptable.cabal
+++ b/pptable.cabal
@@ -1,5 +1,5 @@
 name:                pptable
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:            Pretty Print containers in a tabular format
 description:         Please see README.md
 homepage:            https://github.com/gdevanla/pptable#readme
diff --git a/src/Text/PrettyPrint/Tabilize.hs b/src/Text/PrettyPrint/Tabilize.hs
--- a/src/Text/PrettyPrint/Tabilize.hs
+++ b/src/Text/PrettyPrint/Tabilize.hs
@@ -4,6 +4,7 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE DefaultSignatures #-}
 {-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE ConstrainedClassMethods #-}
 
 -- | Module implements the default methods for Tabilize
 
@@ -93,7 +94,7 @@
 -- | Specialized class that provides default methods
 -- methods to print List, Map or Vector values as a
 -- pretty table
-class Tabilize a where
+class (Data a) => Tabilize a where
   -- | Return a list of values wrapped in a Box. Each entry in input is assumed to be a
   -- list of records keyed by any data type. The first entry in the
   -- list of values will be used to infer the names of fields
@@ -138,7 +139,7 @@
   -- > "amzn"     "AMZN"     799.161717      3.7886e11
   -- > "goog"     "GOOG"     774.210101      5.3209e11
   -- > "yhoo"     "YHOO"     42.2910101         4.0e10
-  printMap :: (Show b, Data a) => Map.Map b a -> IO ()
+  printMap :: (Show b) => Map.Map b a -> IO ()
   printMap m = do
     let r = head . Map.elems $ m
     let header = constrFields . toConstr $ r
@@ -155,7 +156,7 @@
   -- > "YHOO"     42.2910101         4.0e10
   -- > "GOOG"     774.210101      5.3209e11
   -- > "AMZN"     799.161717      3.7886e11
-  printList :: (Data a) => [a] -> IO ()
+  printList :: [a] -> IO ()
   printList m = do
     let r = head $ m
     let header = constrFields . toConstr $ r
@@ -173,7 +174,7 @@
   -- > "YHOO"     42.2910101         4.0e10
   -- > "GOOG"     774.210101      5.3209e11
   -- > "AMZN"     799.161717      3.7886e11
-  printVector :: (Data a) => V.Vector a -> IO ()
+  printVector :: V.Vector a -> IO ()
   printVector m = do
     let r = m V.! 0
     let header = constrFields . toConstr $ r
diff --git a/test/Spec.hs b/test/Spec.hs
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -1,6 +1,7 @@
 {-# OPTIONS_GHC -fno-warn-missing-signatures #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE ConstrainedClassMethods #-}
 
 import Test.Tasty
 import Data.Map as M
@@ -23,11 +24,11 @@
                test_double::Double}
   deriving (Data, Show, G.Generic)
 data R01 =  R01 {r1_id::Int, nested_r::R0}
-  deriving (Show, G.Generic)
+  deriving (Show, G.Generic, Data)
 data R3 =  R3 {r3_id::Int, nested_rlist::[R0]}
-  deriving (Show, G.Generic)
+  deriving (Show, G.Generic, Data)
 data R4 = R4 {r4_id::Int, nested_rtuple::(R0,R0)}
-  deriving (Show, G.Generic)
+  deriving (Show, G.Generic, Data)
 
 instance Tabilize R0
 instance Tabilize R01