diff --git a/apiary.cabal b/apiary.cabal
--- a/apiary.cabal
+++ b/apiary.cabal
@@ -1,5 +1,5 @@
 name:                apiary
-version:             0.4.0.1
+version:             0.4.0.2
 x-revision:          1
 synopsis:            Simple web framework inspired by scotty.
 description:
diff --git a/src/Control/Monad/Apiary/Internal.hs b/src/Control/Monad/Apiary/Internal.hs
--- a/src/Control/Monad/Apiary/Internal.hs
+++ b/src/Control/Monad/Apiary/Internal.hs
@@ -97,6 +97,7 @@
     grd <- getGuard
     addRoute $ grd >>= tr . apply a
 
+{-# DEPRECATED action_ "use action method." #-}
 action_ :: Monad m => ActionT m () -> ApiaryT c m ()
 action_ a = do
     tr <- getRunner