diff --git a/driver/Main.hs b/driver/Main.hs
--- a/driver/Main.hs
+++ b/driver/Main.hs
@@ -2,15 +2,29 @@
 
 import           Prelude ()
 import           Prelude.Compat
-import           Control.Monad
-import           Control.DeepSeq
+import           Control.Monad.Compat
 import           Control.Exception
 import           System.IO.Error
+import           Data.List.Compat
+import           Data.Version (showVersion)
+import           Control.DeepSeq
 
+import           Paths_hpack (version)
 import           Run
 
+header :: String
+header = unlines [
+    "-- This file has been generated from " ++ configFile ++ " by hpack version " ++ showVersion version ++ "."
+  , "--"
+  , "-- see: https://github.com/sol/hpack"
+  , ""
+  ]
+
 main :: IO ()
 main = do
   (name, new) <- run
-  old <- force . either (const Nothing) Just <$> tryJust (guard . isDoesNotExistError) (readFile name)
-  unless (old == Just new) (writeFile name new)
+  old <- force . either (const Nothing) (Just . stripHeader) <$> tryJust (guard . isDoesNotExistError) (readFile name)
+  unless (old == Just (lines new)) (writeFile name $ header ++ new)
+  where
+    stripHeader :: String -> [String]
+    stripHeader = dropWhile null . dropWhile ("--" `isPrefixOf`) . lines
diff --git a/hpack.cabal b/hpack.cabal
--- a/hpack.cabal
+++ b/hpack.cabal
@@ -3,10 +3,11 @@
 -- see: https://github.com/sol/hpack
 
 name:           hpack
-version:        0.1.0
+version:        0.1.1
 synopsis:       An alternative format for Haskell packages
 homepage:       https://github.com/sol/hpack#readme
 bug-reports:    https://github.com/sol/hpack/issues
+maintainer:     Simon Hengel <sol@typeful.net>
 license:        MIT
 license-file:   LICENSE
 build-type:     Simple
diff --git a/src/Run.hs b/src/Run.hs
--- a/src/Run.hs
+++ b/src/Run.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE QuasiQuotes, RecordWildCards #-}
 module Run (
   run
+, configFile
 -- exported for testing
 , renderPackage
 ) where
@@ -10,9 +11,7 @@
 import           Data.Maybe
 import           Data.List
 import           System.Exit.Compat
-import           Data.Version (showVersion)
 
-import           Paths_hpack (version)
 import           Util
 import           Config
 
@@ -29,13 +28,7 @@
       old <- tryReadFile cabalFile
 
       let alignment = fromMaybe 16 (old >>= sniffAlignment)
-          output = concat [
-              "-- This file has been generated from " ++ configFile ++ " by hpack version " ++ showVersion version ++ ".\n"
-            , "--\n"
-            , "-- see: https://github.com/sol/hpack\n"
-            , "\n"
-            , renderPackage alignment (maybe [] extractFieldOrderHint old) package
-            ]
+          output = renderPackage alignment (maybe [] extractFieldOrderHint old) package
       return (cabalFile, output)
     Left err -> die err