diff --git a/Data/Histogram/Bin/Classes.hs b/Data/Histogram/Bin/Classes.hs
--- a/Data/Histogram/Bin/Classes.hs
+++ b/Data/Histogram/Bin/Classes.hs
@@ -75,7 +75,7 @@
   {-# INLINE binsList #-}
 
 
--- | IntervalBin for which domain is single finite interval
+-- | 'IntervalBin' which domain is single finite interval
 class IntervalBin b => Bin1D b where
   -- | Minimal accepted value of histogram
   lowerLimit :: b -> BinValue b
@@ -93,9 +93,10 @@
     where
       n = nBins b       
 
--- | Binning algorithm which individual 
+-- | Binning algorithm which allows to append and prepend bins.
 class Bin1D b => GrowBin b where
-  -- | Set numbers to zero. By convention bins are shrinked to lower bound
+  -- | Set number of bins to zero. By convention bins are shrinked to
+  --   lower bound.
   zeroBin    :: b -> b
   -- | Append one bin at upper bound
   appendBin  :: b -> b
diff --git a/Data/Histogram/Bin/Extra.hs b/Data/Histogram/Bin/Extra.hs
--- a/Data/Histogram/Bin/Extra.hs
+++ b/Data/Histogram/Bin/Extra.hs
@@ -138,7 +138,7 @@
 
 -- Calculate inverse permutation
 invertPermutationTable :: U.Vector Int -> U.Vector Int
-invertPermutationTable v = U.create $ do a <- M.newWith n (-1)
+invertPermutationTable v = U.create $ do a <- M.replicate n (-1)
                                          forM_ [0..n-1] (writeInvert a)
                                          return a
   where
diff --git a/Data/Histogram/Fill.hs b/Data/Histogram/Fill.hs
--- a/Data/Histogram/Fill.hs
+++ b/Data/Histogram/Fill.hs
@@ -10,6 +10,7 @@
 --
 module Data.Histogram.Fill ( -- * Builder type class
                              HistBuilder(..)
+                             -- ** Operators
                            , (<<-)
                            , (<<-|)
                            , (<<?)
@@ -100,6 +101,7 @@
 (<<?) = flip addCut
 {-# INLINE (<<?) #-}
 
+-- | Apply function which modify builder
 (<<-$) :: HistBuilder h => h a b -> (h a b -> h a' b) -> h a' b
 h <<-$ f = f h
 {-# INLINE (<<-$) #-}
diff --git a/Data/Histogram/Generic.hs b/Data/Histogram/Generic.hs
--- a/Data/Histogram/Generic.hs
+++ b/Data/Histogram/Generic.hs
@@ -140,11 +140,11 @@
 outOfRange :: Histogram v bin a -> Maybe (a,a)
 outOfRange (Histogram _ uo _) = uo
 
--- | Convert histogram to list.
+-- | Convert histogram data to list.
 asList :: (Vector v a, Bin bin) => Histogram v bin a -> [(BinValue bin, a)]
 asList (Histogram bin _ arr) = map (fromIndex bin) [0..] `zip` G.toList arr
 
--- | Convert histogram to vector
+-- | Convert histogram data to vector
 asVector :: (Bin bin, Vector v a, Vector v (BinValue bin), Vector v (BinValue bin,a)) 
          => Histogram v bin a -> v (BinValue bin, a) 
 asVector (Histogram bin _ arr) = G.zip (G.generate (nBins bin) (fromIndex bin) ) arr
@@ -187,10 +187,12 @@
         f2 (x,x') (y,y') = (f x y, f x' y')
 
 
+-- | Slice histogram using indices.
 sliceByIx :: (Bin1D bin, Vector v a) => Int -> Int -> Histogram v bin a -> Histogram v bin a
 sliceByIx i j (Histogram b _ v) = 
   Histogram (sliceBin i j b) Nothing (G.slice i (j - i + 1) v)
 
+-- | Slice histogram using bin values. Value will be included in range.
 sliceByVal :: (Bin1D bin, Vector v a) => BinValue bin -> BinValue bin -> Histogram v bin a -> Histogram v bin a
 sliceByVal x y h 
   | inRange b x && inRange b y = sliceByIx (toIndex b x) (toIndex b y) h
diff --git a/Data/Histogram/ST.hs b/Data/Histogram/ST.hs
--- a/Data/Histogram/ST.hs
+++ b/Data/Histogram/ST.hs
@@ -40,8 +40,8 @@
 --   passed to function.
 newMHistogram :: (PrimMonad m, Bin bin, U.Unbox a) => a -> bin -> m (MHistogram (PrimState m) bin a)
 newMHistogram zero bin = do
-  uo <- MU.newWith 2 zero
-  a  <- MU.newWith (nBins bin) zero
+  uo <- MU.replicate 2 zero
+  a  <- MU.replicate (nBins bin) zero
   return $ MHistogram bin uo a
 {-# INLINE newMHistogram #-}
 
diff --git a/histogram-fill.cabal b/histogram-fill.cabal
--- a/histogram-fill.cabal
+++ b/histogram-fill.cabal
@@ -1,5 +1,5 @@
 Name:           histogram-fill
-Version:        0.5
+Version:        0.5.1
 Cabal-Version:  >= 1.6
 License:        BSD3
 License-File:   LICENSE
@@ -20,7 +20,7 @@
 Library
   Build-Depends:        base >=3 && <5,
                         primitive,
-                        vector >= 0.6.0.2
+                        vector >= 0.7
 --                        monoid-statistics == 0.1.*
   Exposed-modules:      Data.Histogram
                         Data.Histogram.Generic