diff --git a/Concurrential.cabal b/Concurrential.cabal
--- a/Concurrential.cabal
+++ b/Concurrential.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                Concurrential
-version:             0.5.0.0
+version:             0.5.0.1
 synopsis:            Mix concurrent and sequential computation
 -- description:         
 homepage:            http://github.com/avieth/Concurrential
@@ -27,6 +27,7 @@
                        , DeriveFunctor
                        , ScopedTypeVariables
 
-  build-depends:       base >=4.7 && <4.8, async >=2.0 && <2.1
+  build-depends:       base >=4.7 && <4.9
+                     , async >=2.0 && <2.1
   -- hs-source-dirs:      
   default-language:    Haskell2010
diff --git a/Control/Concurrent/Concurrential.hs b/Control/Concurrent/Concurrential.hs
--- a/Control/Concurrent/Concurrential.hs
+++ b/Control/Concurrent/Concurrential.hs
@@ -77,7 +77,7 @@
       Concurrent io -> Concurrent $ fmap f io
 
 -- | Description of computation which is composed of sequential and concurrent
---   parts in some monad @m@.
+--   parts.
 data Concurrential t where
     SCAtom :: Choice IO t -> Concurrential t
     SCBind :: Concurrential s -> (s -> Concurrential t) -> Concurrential t