diff --git a/Control/Comonad.hs b/Control/Comonad.hs
--- a/Control/Comonad.hs
+++ b/Control/Comonad.hs
@@ -16,6 +16,8 @@
 infixr 1 <<=, =>=, =<=
 
 class Functor ɯ => Comonad ɯ where
+    {-# MINIMAL copure, (cut | (<<=)) #-}
+
     copure :: ɯ a -> a
 
     cut :: ɯ a -> ɯ (ɯ a)
diff --git a/Control/Semigroupoid.hs b/Control/Semigroupoid.hs
--- a/Control/Semigroupoid.hs
+++ b/Control/Semigroupoid.hs
@@ -6,6 +6,8 @@
 import Data.Functor.Const (Const (..))
 import Data.Tagged (Tagged (..))
 
+infixr 9 .
+
 -- | 'Category' sans 'id'
 --
 -- Laws:
diff --git a/hs-functors.cabal b/hs-functors.cabal
--- a/hs-functors.cabal
+++ b/hs-functors.cabal
@@ -1,5 +1,5 @@
 name:                hs-functors
-version:             0.1.7.0
+version:             0.1.7.1
 synopsis:            Functors from products of Haskell and its dual to Haskell
 -- description:         
 license:             BSD3