diff --git a/Data/PrimitiveArray.hs b/Data/PrimitiveArray.hs
--- a/Data/PrimitiveArray.hs
+++ b/Data/PrimitiveArray.hs
@@ -19,7 +19,8 @@
 -- * The PrimArray class.
 
 class PrimArrayOps a b where
-  data PrimArray  a b :: *                -- ^ PrimArray data type
+  -- | PrimArray data type
+  data PrimArray  a b :: *
   unsafeIndex :: PrimArray a b -> a -> b  -- ^ Index an array without bounds-checking
   assocs :: PrimArray a b -> [(a,b)]      -- ^ All associations of (key,value)
   fromAssocs :: a -> a -> b -> [(a,b)] -> PrimArray a b -- ^ Pure build function
@@ -30,7 +31,8 @@
 
 
 class (PrimMonad s) => PrimArrayOpsM a b s where
-  data PrimArrayM a b s :: *              -- ^ Monadic data type
+  -- | Monadic data type
+  data PrimArrayM a b s :: *
   readM :: PrimArrayM a b s -> a -> s b   -- ^ Monadic read
   writeM :: PrimArrayM a b s -> a -> b -> s ()  -- ^ Monadic write
   boundsM :: PrimArrayM a b s -> s (a,a)  -- ^ Monadic bounds
diff --git a/Data/PrimitiveArray/Ix.hs b/Data/PrimitiveArray/Ix.hs
--- a/Data/PrimitiveArray/Ix.hs
+++ b/Data/PrimitiveArray/Ix.hs
@@ -4,6 +4,11 @@
 {-# LANGUAGE MultiParamTypeClasses #-}
 
 -- | PrimitiveArray with 'Ix' keys.
+--
+-- NOTE GHC 6.12.3 (and earlier, I guess) does not produce optimal code.
+-- Current head (6.13) produces very nice code. For example, 'unsafeIndex' for
+-- 2-dim. tables with lower bound (0,0) produces one multiplication, one
+-- addition, one lookup, all using machine Int's.
 
 module Data.PrimitiveArray.Ix where
 
diff --git a/PrimitiveArray.cabal b/PrimitiveArray.cabal
--- a/PrimitiveArray.cabal
+++ b/PrimitiveArray.cabal
@@ -1,9 +1,11 @@
 Name:           PrimitiveArray
-Version:        0.0.2.1
+Version:        0.0.2.2
 License:        BSD3
 License-file:   LICENSE
 Author:         Christian Hoener zu Siederdissen
 Maintainer:     choener@tbi.univie.ac.at
+Copyright:      Christian Hoener zu Siederdissen, 2010
+Homepage:       http://www.tbi.univie.ac.at/~choener/Haskell/
 Stability:      Experimental
 Category:       Data
 Build-type:     Simple
@@ -14,6 +16,8 @@
 Description:
                 Provides unboxed multidimensional tables with a small
                 interface. Comes with an instance for Ix keys.
+                .
+                * haddock should work now
 
 extra-source-files:
   Benchmarks/Index.hs