diff --git a/src/Test/QuickCheck/Classes.hs b/src/Test/QuickCheck/Classes.hs
index 4e20f16..58a67d8 100644
--- a/src/Test/QuickCheck/Classes.hs
+++ b/src/Test/QuickCheck/Classes.hs
@@ -6,9 +6,9 @@
 {-| This library provides sets of properties that should hold for common
     typeclasses.
 
-    /Note:/ on GHC < 8.5, this library uses the higher-kinded typeclasses
+    /Note:/ on GHC < 8.6, this library uses the higher-kinded typeclasses
     ('Data.Functor.Classes.Show1', 'Data.Functor.Classes.Eq1', 'Data.Functor.Classes.Ord1', etc.),
-    but on GHC >= 8.5, it uses `-XQuantifiedConstraints` to express these
+    but on GHC >= 8.6, it uses @-XQuantifiedConstraints@ to express these
     constraints more cleanly.
 -}
 module Test.QuickCheck.Classes