diff --git a/Control/DeepSeq.hs b/Control/DeepSeq.hs
index 7225559..050f691 100644
--- a/Control/DeepSeq.hs
+++ b/Control/DeepSeq.hs
@@ -499,7 +499,9 @@ instance NFData1 Ratio where
 instance (NFData1 f, NFData1 g) => NFData1 (Compose f g) where
   liftRnf r = liftRnf (liftRnf r) . getCompose
 
--- | @since 1.4.3.0
+-- | Note: in @deepseq-1.5.0.0@ this instance's superclasses were changed.
+-- 
+-- @since 1.4.3.0
 instance (NFData (f (g a))) => NFData (Compose f g a) where
   rnf (Compose fga) = rnf fga
 
@@ -508,7 +510,9 @@ instance (NFData1 f, NFData1 g) => NFData1 (Functor.Sum f g) where
   liftRnf rnf0 (Functor.InL l) = liftRnf rnf0 l
   liftRnf rnf0 (Functor.InR r) = liftRnf rnf0 r
 
--- | @since 1.4.3.0
+-- | Note: in @deepseq-1.5.0.0@ this instance's superclasses were changed.
+-- 
+-- @since 1.4.3.0
 instance (NFData (f a), NFData (g a)) => NFData (Functor.Sum f g a) where
   rnf (Functor.InL fa) = rnf fa
   rnf (Functor.InR ga) = rnf ga
@@ -517,7 +521,9 @@ instance (NFData (f a), NFData (g a)) => NFData (Functor.Sum f g a) where
 instance (NFData1 f, NFData1 g) => NFData1 (Functor.Product f g) where
   liftRnf rnf0 (Functor.Pair f g) = liftRnf rnf0 f `seq` liftRnf rnf0 g
 
--- | @since 1.4.3.0
+-- | Note: in @deepseq-1.5.0.0@ this instance's superclasses were changed.
+-- 
+-- @since 1.4.3.0
 instance (NFData (f a), NFData (g a)) => NFData (Functor.Product f g a) where
   rnf (Functor.Pair fa ga) = rnf fa `seq` rnf ga