diff --git a/hpdft.cabal b/hpdft.cabal
--- a/hpdft.cabal
+++ b/hpdft.cabal
@@ -1,6 +1,6 @@
 name:                hpdft
-version:             0.1.0.1
-synopsis:            tools to poke pdf using haskell
+version:             0.1.0.2
+synopsis:            A tool for looking through PDF file using Haskell
 -- description:         
 homepage:            https://github.com/k16shikano/hpdft
 license:             MIT
diff --git a/src/PDF/ContentStream.hs b/src/PDF/ContentStream.hs
--- a/src/PDF/ContentStream.hs
+++ b/src/PDF/ContentStream.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE OverloadedStrings, FlexibleContexts #-}
 
 module PDF.ContentStream 
        ( deflate