diff --git a/Data/Text/Glyphize.hs b/Data/Text/Glyphize.hs
--- a/Data/Text/Glyphize.hs
+++ b/Data/Text/Glyphize.hs
@@ -1,3 +1,8 @@
+-- | HarfBuzz is a text shaping library.
+-- Using the HarfBuzz library allows programs to convert a sequence of
+-- Unicode input into properly formatted and positioned glyph output —
+-- for any writing system and language.
+-- See `shape` for the central function all other datatypes serves to support.
 module Data.Text.Glyphize (shape, version, versionAtLeast, versionString,
 
     Buffer(..), ContentType(..), ClusterLevel(..), Direction(..), defaultBuffer,
@@ -55,8 +60,8 @@
 -- character in the buffer that has a script other than "common", "inherited",
 -- or "unknown".
 -- Next if the buffer direction is not set it will be set to the natural
--- horizontal direction of the buffer script as returned by `scriptHorizontalDirection`.
--- If `scriptHorizontalDirection` returns `Nothing`, then `DirLTR` is used.
+-- horizontal direction of the buffer script as returned by `scriptHorizontalDir`.
+-- If `scriptHorizontalDir` returns `Nothing`, then `DirLTR` is used.
 -- Finally if buffer language is not set, it will be set to the process's default
 -- language as returned by `languageDefault`. This may change in the future by
 -- taking buffer script into consideration when choosting a language.
diff --git a/Data/Text/Glyphize/Buffer.hs b/Data/Text/Glyphize/Buffer.hs
--- a/Data/Text/Glyphize/Buffer.hs
+++ b/Data/Text/Glyphize/Buffer.hs
@@ -2,7 +2,7 @@
 module Data.Text.Glyphize.Buffer where
 
 import qualified Data.Text.Internal.Lazy as Lazy
-import qualified Data.Text.Lazy as Lazy
+import qualified Data.Text.Lazy as Lazy (Text, pack)
 import qualified Data.Text.Internal as Txt
 import Data.Char (toUpper, toLower)
 import Control.Monad (forM)
@@ -10,6 +10,7 @@
 
 --- To fill computed text property.
 import Data.Text.Encoding (decodeUtf8Lenient)
+import Codec.Binary.UTF8.Light (encodeUTF8, w2c, c2w)
 
 import qualified Data.Text.Array as A
 import GHC.Exts (ByteArray#, sizeofByteArray#, Int#)
@@ -33,6 +34,7 @@
 data Buffer = Buffer {
     text :: Lazy.Text,
     -- ^ The Unicode text, in visual order, for HarfBuzz to convert into glyphs.
+    -- See https://hackage.haskell.org/package/text-2.0.1/docs/Data-Text-Internal-Lazy.html#t:Text for details.
     contentType :: Maybe ContentType,
     -- ^ What the bytes of the ByteString contents represents,
     -- namely unicode characters (before shaping) or glyphs (result of shaping).
@@ -116,7 +118,7 @@
 
 -- | The direction of a text segment or buffer.
 data Direction = DirLTR | DirRTL | DirTTB | DirBTT deriving (Eq, Show, Read, Ord)
--- | Converts a string to an hb_direction_t.
+-- | Converts a string to an `Direction`.
 -- Matching is loose and applies only to the first letter. For examples, 
 -- "LTR" and "left-to-right" will both return HB_DIRECTION_LTR.
 dirFromStr ('L':_) = Just DirLTR
@@ -128,7 +130,7 @@
 dirFromStr ('B':_) = Just DirBTT
 dirFromStr ('b':_) = Just DirBTT
 dirFromStr _ = Nothing
--- | Converts an hb_direction_t to a string.
+-- | Converts an `Direction` to a string.
 dirToStr DirLTR = "ltr"
 dirToStr DirRTL = "rtl"
 dirToStr DirTTB = "ttb"
@@ -166,7 +168,7 @@
 int2dir 7 = Just DirBTT
 int2dir _ = Nothing
 
--- | Fetches the hb_direction_t of a script when it is set horizontally.
+-- | Fetches the `Direction` of a script when it is set horizontally.
 -- All right-to-left scripts will return `DirRTL`.
 -- All left-to-right scripts will return `DirLTR`.
 -- Scripts that can be written either horizontally or vertically will return `Nothing`.
@@ -280,11 +282,6 @@
     w2c (shiftR tag 8 .&. 0x7f),
     w2c (shiftR tag 0 .&. 0x7f)
   ]
-
-c2w :: Char -> Word32
-c2w = toEnum . fromEnum
-w2c :: Word32 -> Char
-w2c = toEnum . fromEnum
 
 ------
 --- Haskell-to-C conversion
diff --git a/Data/Text/Glyphize/Font.hs b/Data/Text/Glyphize/Font.hs
--- a/Data/Text/Glyphize/Font.hs
+++ b/Data/Text/Glyphize/Font.hs
@@ -5,11 +5,11 @@
 import Data.ByteString (packCStringLen)
 import Data.Word (Word8, Word32)
 import Data.Int (Int32)
-import FreeType.Core.Base (FT_Face)
-import Data.Text.Glyphize.Buffer (tag_to_string, tag_from_string, Direction, dir2int,
-                                c2w, w2c)
+import FreeType.Core.Base (FT_Face, frSize)
+import Data.Text.Glyphize.Buffer (tag_to_string, tag_from_string, Direction, dir2int)
 
 import Control.Monad (forM, unless)
+import Codec.Binary.UTF8.Light (w2c, c2w)
 import Data.Maybe (fromMaybe)
 
 import System.IO.Unsafe (unsafePerformIO)
@@ -37,7 +37,7 @@
     featValue :: Word32,
     -- ^ The value of the feature.
     -- 0 disables the feature, non-zero (usually 1) enables the feature.
-    -- For features implemented as lookup type 3 (like 'salt') the value
+    -- For features implemented as lookup type 3 (like "salt") the value
     -- is a one based index into the alternates.
     featStart :: Word,
     -- ^ The cluster to start applying this feature setting (inclusive).
@@ -47,7 +47,7 @@
 instance GStorable Feature
 -- | Parses a string into a hb_feature_t.
 -- The format for specifying feature strings follows. All valid CSS
--- font-feature-settings values other than 'normal' and the global values
+-- font-feature-settings values other than "normal" and the global values
 -- are also accepted. CSS string escapes are not supported.
 -- See https://harfbuzz.github.io/harfbuzz-hb-common.html#hb-feature-from-string
 -- for additional details.
@@ -73,14 +73,14 @@
 -- [OpenType Axis Tag Registry](https://docs.microsoft.com/en-us/typography/opentype/spec/dvaraxisreg).
 data Variation = Variation {
     varTag' :: Word32,
-    -- ^ Tag of the variation-axis name. Use `verTag` to decode as an ASCII string.
+    -- ^ Tag of the variation-axis name. Use `varTag` to decode as an ASCII string.
     varValue :: Float
     -- ^ Value of the variation axis.
 } deriving (Read, Show, Generic)
 instance GStorable Variation
 -- | Parses a string into a hb_variation_t.
 -- The format for specifying variation settings follows.
--- All valid CSS font-variation-settings values other than 'normal' and 'inherited'
+-- All valid CSS font-variation-settings values other than "normal" and "inherited"
 -- are also accepted, though, not documented below.
 -- The format is a tag, optionally followed by an equals sign, followed by a number.
 -- For example wght=500, or slnt=-7.5.
@@ -128,9 +128,9 @@
 -- can contain more than one face. Face indices within such collections are zero-based.
 -- Note: If the blob font format is not a collection, index is ignored. Otherwise,
 -- only the lower 16-bits of index are used. The unmodified index can be accessed
--- via hb_face_get_index().
--- Note: The high 16-bits of index, if non-zero, are used by hb_font_create() to
--- load named-instances in variable fonts. See hb_font_create() for details.
+-- via `faceIndex`.
+-- Note: The high 16-bits of index, if non-zero, are used by `createFont` to
+-- load named-instances in variable fonts. See `createFont` for details.
 createFace :: ByteString -> Word -> Face
 createFace bytes index = unsafePerformIO $ do
     blob <- bs2blob bytes
@@ -320,10 +320,10 @@
 foreign import ccall "hb_font_make_immutable" hb_font_make_immutable :: Font_ -> IO ()
 foreign import ccall "&hb_font_destroy" hb_font_destroy :: FunPtr (Font_ -> IO ())
 
--- | Creates an hb_font_t font object from the specified FT_Face.
+-- | Creates an `Font` object from the specified FT_Face.
 -- Note: You must set the face size on ft_face before calling `ftCreateFont` on it.
 -- HarfBuzz assumes size is always set
--- and will access `size` member of `FT_Face` unconditionally.
+-- and will access `frSize`` member of `FT_Face` unconditionally.
 ftCreateFont :: FT_Face -> IO Font
 ftCreateFont fce = do
     font <- hb_ft_font_create_referenced fce
@@ -440,7 +440,7 @@
 -- | Fetches the `GlyphExtents` data for a glyph ID in the specified `Font`,
 -- with respect to the origin in a text segment in the specified direction.
 -- Calls the appropriate direction-specific variant (horizontal or vertical)
--- depending on the value of `dir`.
+-- depending on the value of given `Direction`.
 fontGlyphExtentsForOrigin :: Font -> Word32 -> Maybe Direction -> Maybe GlyphExtents
 fontGlyphExtentsForOrigin font glyph dir = unsafePerformIO $
     withForeignPtr font $ \font' -> alloca $ \ret -> do
@@ -517,7 +517,7 @@
 
 -- | Fetches the kerning-adjustment value for a glyph-pair in the specified `Font`.
 -- Calls the appropriate direction-specific variant (horizontal or vertical)
--- depending on the value of `dir`.
+-- depending on the value of given `Direction`.
 fontGlyphKerningForDir :: Font -> Word32 -> Word32 -> Maybe Direction -> (Int32, Int32)
 fontGlyphKerningForDir font a b dir = unsafePerformIO $ withForeignPtr font $ \font' ->
     alloca $ \x' -> alloca $ \y' -> do
@@ -529,7 +529,7 @@
     hb_font_get_glyph_kerning_for_direction ::
         Font_ -> Word32 -> Word32 -> Int -> Ptr Int32 -> Ptr Int32 -> IO ()
 
--- | Fetches the glyph-name string for a glyph ID in the specified `font`.
+-- | Fetches the glyph-name string for a glyph ID in the specified `Font`.
 fontGlyphName :: Font -> Word32 -> Maybe String
 fontGlyphName a b = fontGlyphName_ a b 32
 -- | Variant of `fontGlyphName` which lets you specify the maximum of the return value.
@@ -546,7 +546,7 @@
 
 -- | Fetches the (X,Y) coordinates of the origin for a glyph in the specified `Font`.
 -- Calls the appropriate direction-specific variant (horizontal or vertical)
--- depending on the value of `dir`.
+-- depending on the value of given `Direction`.
 fontGlyphOriginForDir :: Font -> Word32 -> Maybe Direction -> (Int32, Int32)
 fontGlyphOriginForDir font glyph dir = unsafePerformIO $ withForeignPtr font $ \font' ->
     alloca $ \x' -> alloca $ \y' -> do
diff --git a/harfbuzz-pure.cabal b/harfbuzz-pure.cabal
--- a/harfbuzz-pure.cabal
+++ b/harfbuzz-pure.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             0.1.0.1
+version:             1.0.0.0
 
 -- A short (one-line) description of the package.
 synopsis:            Pure-functional Harfbuzz language bindings
@@ -51,16 +51,16 @@
 
 library
   -- Modules exported by the library.
-  exposed-modules:     Data.Text.Glyphize, Data.Text.Glyphize.Buffer, Data.Text.Glyphize.Font
+  exposed-modules:     Data.Text.Glyphize
   
   -- Modules included in this library but not exported.
-  -- other-modules:       
+  other-modules:       Data.Text.Glyphize.Buffer, Data.Text.Glyphize.Font
   
   -- LANGUAGE extensions used by modules in this package.
   -- other-extensions:    
   
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.12 && <4.13, text >= 2.0 && < 3,
+  build-depends:       base >=4.12 && <4.13, text >= 2.0 && < 3, utf8-light >= 0.4 && < 0.5,
                        bytestring >= 0.11, freetype2 >= 0.2, derive-storable >= 0.3 && < 1
   pkgconfig-depends:   harfbuzz