diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,3 +13,9 @@
 
 ## v0.2.0.1
 + Added CHANGELOG.md to source package
+
+## v0.2.1
++ Added __
++ Also exports `Data.Ix`, `Data.Array`, `Data.Bits`, `Data.Ratio`, `Data.Complex`
+
+
diff --git a/hydrogen-prelude.cabal b/hydrogen-prelude.cabal
--- a/hydrogen-prelude.cabal
+++ b/hydrogen-prelude.cabal
@@ -1,5 +1,5 @@
 name:                 hydrogen-prelude
-version:              0.2.0.1
+version:              0.2.1
 homepage:             https://github.com/scravy/hydrogen-prelude
 synopsis:             Hydrogen Prelude
 license:              BSD3
@@ -21,6 +21,7 @@
                       , Hydrogen.Prelude.IO
                       , Hydrogen.Prelude.System
   build-depends:      base ==4.7.*
+                      , array ==0.5.*
                       , containers ==0.5.*
                       , directory ==1.2.*
                       , filepath ==1.3.*
diff --git a/src/Hydrogen/Prelude.hs b/src/Hydrogen/Prelude.hs
--- a/src/Hydrogen/Prelude.hs
+++ b/src/Hydrogen/Prelude.hs
@@ -3,18 +3,24 @@
   , module Control.Applicative
   , module Control.Arrow
   , module Control.Monad
+  , module Data.Array
+  , module Data.Bits
   , module Data.Bool
   , module Data.Char
+  , module Data.Complex
   , module Data.Either
+  , module Data.Fixed
   , module Data.Function
   , module Data.Functor.Identity
   , module Data.Functor.Reverse
   , module Data.Hashable
   , module Data.Foldable
   , module Data.Int
+  , module Data.Ix
   , module Data.List
   , module Data.Maybe
   , module Data.Ord
+  , module Data.Ratio
   , module Data.String
   , module Data.Time
   , module Data.Tuple
@@ -56,15 +62,21 @@
   , sequence_
   )
 
+import "array" Data.Array
+
+import "base" Data.Bits hiding (bitSize)
 import "base" Data.Bool
 import "base" Data.Char
+import "base" Data.Complex
 import "base" Data.Either
+import "base" Data.Fixed
 import "base" Data.Foldable
 import "base" Data.Function
 import "transformers" Data.Functor.Identity (Identity (..))
 import "transformers" Data.Functor.Reverse (Reverse (..))
 import "hashable" Data.Hashable
 import "base" Data.Int
+import "base" Data.Ix
 import "base" Data.List hiding (
     all
   , and
@@ -89,6 +101,7 @@
   )
 import "base" Data.Maybe
 import "base" Data.Ord
+import "base" Data.Ratio
 import "base" Data.String
 import "time" Data.Time
 import "base" Data.Tuple
@@ -108,4 +121,7 @@
 
 for :: Functor f => f a -> (a -> b) -> f b
 for = flip fmap
+
+__ :: a
+__ = error "Hydrogen.Prelude.undefined"