diff --git a/dunai.cabal b/dunai.cabal
--- a/dunai.cabal
+++ b/dunai.cabal
@@ -1,5 +1,5 @@
 name:                dunai
-version:             0.8.0
+version:             0.8.1
 synopsis:            Generalised reactive framework supporting classic, arrowized and monadic FRP.
 homepage:            https://github.com/ivanperez-keera/dunai
 description:
diff --git a/src/Control/Arrow/Util.hs b/src/Control/Arrow/Util.hs
--- a/src/Control/Arrow/Util.hs
+++ b/src/Control/Arrow/Util.hs
@@ -8,15 +8,6 @@
 constantly = arr . const
 {-# INLINE constantly #-}
 
--- import Control.Category (id)
--- import Prelude hiding (id)
-
--- (&&&!) :: Arrow a => a b c -> a b () -> a b c
--- a1 &&&! a2 = (a1 &&& a2) >>> arr fst
-
--- sink :: Arrow a => a b c -> a c () -> a b c
--- a1 `sink` a2 = a1 >>> (id &&& a2) >>> arr fst
-
 -- * Apply functions at the end.
 --
 -- | Alternative name for '^<<'.