diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # lzlib
 
+## 1.0.5.0
+
+  * Export `LZError`
+
 ## 1.0.4.0
 
   * Add `Enum` instance to `CompressionLevel`
diff --git a/lzlib.cabal b/lzlib.cabal
--- a/lzlib.cabal
+++ b/lzlib.cabal
@@ -1,6 +1,6 @@
 cabal-version:      1.18
 name:               lzlib
-version:            1.0.4.0
+version:            1.0.5.0
 license:            BSD3
 license-file:       LICENSE
 copyright:          Copyright: (c) 2019-2020 Vanessa McHale
@@ -46,7 +46,6 @@
     c-sources:        cbits/lzlib.c
     hs-source-dirs:   src
     other-modules:    Codec.Lzip.Raw
-    other-modules:    Codec.Lzip.Pure
     default-language: Haskell2010
     other-extensions: DeriveDataTypeable TupleSections
     include-dirs:     cbits
diff --git a/src/Codec/Lzip.hs b/src/Codec/Lzip.hs
--- a/src/Codec/Lzip.hs
+++ b/src/Codec/Lzip.hs
@@ -1,5 +1,8 @@
 {-# LANGUAGE TupleSections #-}
 
+-- | Functions throw 'LZErrno' on failure
+--
+-- Compression functions should work on arbitrary data
 module Codec.Lzip ( -- * Compression
                     compress
                   , compressBest
@@ -14,6 +17,13 @@
                   , compressFileBest
                   , compressFileFast
                   , CompressionLevel (..)
+                  , LZErrno
+                    ( LzMemError
+                    , LzHeaderError
+                    , LzUnexpectedEof
+                    , LzDataError
+                    , LzLibraryError
+                    )
                   -- * Decompression
                   , decompress
                   -- * Miscellany
@@ -75,6 +85,8 @@
 -- [lziprecover](https://www.nongnu.org/lzip/lziprecover.html).
 --
 -- Doesn't work on empty 'BSL.ByteString's
+--
+-- Throws 'LZErrno' on error
 decompress :: BSL.ByteString -> BSL.ByteString
 decompress bs = runST $ do
 
diff --git a/src/Codec/Lzip/Pure.hs b/src/Codec/Lzip/Pure.hs
deleted file mode 100644
--- a/src/Codec/Lzip/Pure.hs
+++ /dev/null
@@ -1,13 +0,0 @@
-module Codec.Lzip.Pure ( Member (..)
-                       ) where
-
-import qualified Data.ByteString.Lazy as BSL
-import           Data.Word            (Word32, Word64, Word8)
-
--- see: https://www.nongnu.org/lzip/manual/lzip_manual.html#File-format
-data Member =
-    Member !Word8 !Word8 BSL.ByteString Word32 !Word64 Word64
--- for some reason this is little endian
---
--- pure bz2? huffman coding!
--- https://www.sourceware.org/bzip2/manual/manual.html#limits
diff --git a/src/Codec/Lzip/Raw.chs b/src/Codec/Lzip/Raw.chs
--- a/src/Codec/Lzip/Raw.chs
+++ b/src/Codec/Lzip/Raw.chs
@@ -5,11 +5,15 @@
 --
 -- This library uses 'Foreign.ForeignPtr.ForeignPtr's; to convert a @'Ptr' 'LZDecoder'@ to a @'Foreign.ForeignPtr.ForeignPtr' 'LZDecoder'@, use 'Foreign.ForeignPtr.newForeignPtr'
 module Codec.Lzip.Raw ( -- * Prolegomena
-                        LZErrno (..)
+                        LZErrno
+                          ( LzMemError
+                          , LzHeaderError
+                          , LzUnexpectedEof
+                          , LzDataError
+                          , LzLibraryError
+                          )
                       , lZVersion
-                      , lZStrerror
                       , lZMinDictionarySize
-                      , lZMaxDictionarySize
                       , UInt8
                       -- * Compression functions
                       , LZEncoder
@@ -20,7 +24,6 @@
                       , lZCompressRead
                       , lZCompressWrite
                       , lZCompressWriteSize
-                      , lZCompressErrno
                       , lZCompressFinished
                       -- * Decompression functions
                       , LZDecoder
@@ -58,7 +61,6 @@
 {# fun pure LZ_version as ^ {} -> `String' #}
 {# fun pure LZ_strerror as ^ { `LZErrno' } -> `String' #}
 {# fun pure LZ_min_dictionary_size as ^ {} -> `CInt' #}
-{# fun pure LZ_max_dictionary_size as ^ {} -> `CInt' #}
 
 instance Show LZErrno where
     show = lZStrerror
@@ -75,7 +77,6 @@
 {# fun LZ_compress_read as ^ { `LZEncoderPtr', `Ptr UInt8', `CInt' } -> `CInt' #}
 {# fun LZ_compress_write as ^ { `LZEncoderPtr', `Ptr UInt8', `CInt' } -> `CInt' #}
 {# fun LZ_compress_write_size as ^ { `LZEncoderPtr' } -> `CInt' #}
-{# fun LZ_compress_errno as ^ { `LZEncoderPtr' } -> `LZErrno' #}
 {# fun LZ_compress_finished as ^ { `LZEncoderPtr' } -> `CInt' #}
 
 -- | Abstract data type