diff --git a/catamorphism.cabal b/catamorphism.cabal
--- a/catamorphism.cabal
+++ b/catamorphism.cabal
@@ -1,5 +1,5 @@
 name:                catamorphism
-version:             0.4.0.0
+version:             0.4.0.1
 synopsis:            A package exposing a helper function for generating catamorphisms.
 description:         A package exposing a helper function for generating catamorphisms.
 homepage:            http://github.com/frerich/catamorphism
diff --git a/src/Data/Morphism/Cata.hs b/src/Data/Morphism/Cata.hs
--- a/src/Data/Morphism/Cata.hs
+++ b/src/Data/Morphism/Cata.hs
@@ -19,7 +19,7 @@
 > -- Defines 'bool :: a -> a -> Bool -> a'
 > $(makeCata defaultOptions ''Bool)
 >
-> -- Defines 'maybe :: b -> (Maybe a -> b) -> Maybe a -> b'
+> -- Defines 'maybe :: b -> (a -> b) -> Maybe a -> b'
 > $(makeCata defaultOptions ''Maybe)
 >
 > -- Defines 'either :: (a -> c) -> (b -> c) -> Either a b -> c'