diff --git a/handle-like.cabal b/handle-like.cabal
--- a/handle-like.cabal
+++ b/handle-like.cabal
@@ -2,7 +2,7 @@
 build-type:	Simple
 
 name:		handle-like
-version:	0.0.0.4
+version:	0.0.0.5
 stability:	Experimental
 author:		Yoshikuni Jujo <PAF01143@nifty.ne.jp>
 maintainer:	Yoshikuni Jujo <PAF01143@nifty.ne.jp>
@@ -35,7 +35,7 @@
 source-repository	this
     type:	git
     location:	git://github.com/YoshikuniJujo/forest
-    tag:	handle-like-0.0.0.4
+    tag:	handle-like-0.0.0.5
 
 library
     hs-source-dirs:	src
diff --git a/src/Data/HandleLike.hs b/src/Data/HandleLike.hs
--- a/src/Data/HandleLike.hs
+++ b/src/Data/HandleLike.hs
@@ -16,6 +16,7 @@
 	hlGetLine :: h -> HandleMonad h BS.ByteString
 	hlGetContent :: h -> HandleMonad h BS.ByteString
 	hlClose :: h -> HandleMonad h ()
+	hlDebug :: h -> BS.ByteString -> HandleMonad h ()
 	hlError :: h -> BS.ByteString -> HandleMonad h a
 
 	hlGetByte h = do [b] <- BS.unpack `liftM` hlGet h 1; return b
@@ -25,6 +26,7 @@
 			10 -> return ""
 			_ -> BS.cons b `liftM` hlGetLine h
 	hlGetContent = flip hlGet 1
+	hlDebug = hlPut
 	hlError _ msg = error $ BSC.unpack msg
 
 instance HandleLike Handle where
