diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+0.6.1.1
+-------
+* Fixed issue with needing `KindSignatures` on older GHCs
+
 0.6.1
 -----
 * Added covariant `Day` convolution. It isn't contravariant, but it is inspired by the contravariant construction.
diff --git a/Data/Functor/Contravariant/Day.hs b/Data/Functor/Contravariant/Day.hs
--- a/Data/Functor/Contravariant/Day.hs
+++ b/Data/Functor/Contravariant/Day.hs
@@ -166,7 +166,7 @@
 -- @
 -- 'day1' '.' 'diag' = 'id'
 -- 'day2' '.' 'diag' = 'id'
--- 'runDay '.' 'diag' = \a -> (a,a)
+-- 'runDay' '.' 'diag' = \a -> (a,a)
 -- 'contramap' f . 'diag' = 'diag' . 'contramap' f
 -- @
 
diff --git a/Data/Functor/Day.hs b/Data/Functor/Day.hs
--- a/Data/Functor/Day.hs
+++ b/Data/Functor/Day.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE ExistentialQuantification #-}
+{-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE RankNTypes #-}
 -----------------------------------------------------------------------------
diff --git a/contravariant.cabal b/contravariant.cabal
--- a/contravariant.cabal
+++ b/contravariant.cabal
@@ -1,6 +1,6 @@
 name:          contravariant
 category:      Control, Data
-version:       0.6.1
+version:       0.6.1.1
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -10,8 +10,8 @@
 homepage:      http://github.com/ekmett/contravariant/
 bug-reports:   http://github.com/ekmett/contravariant/issues
 copyright:     Copyright (C) 2007-2014 Edward A. Kmett
-synopsis:      Contravariant functors
-description:   Contravariant functors
+synopsis:      Contravariant functors and Day convolution
+description:   Contravariant functors and Day convolution
 build-type:    Simple
 extra-source-files:
   .travis.yml