diff --git a/libraries/ghc-internal/src/Data/Data.hs b/libraries/ghc-internal/src/Data/Data.hs
index fb59642ee7efc76e8a89d2641ab9f15051e235c4..c2d422990b4cfb4fb3a199dcf2e70bd30209fcd2 100644
--- a/libraries/ghc-internal/src/Data/Data.hs
+++ b/libraries/ghc-internal/src/Data/Data.hs
@@ -625,6 +625,8 @@ mkDataType str cs = DataType
                         }
 
 -- | Constructs a constructor
+--
+-- @since 4.16.0.0
 mkConstrTag :: DataType -> String -> Int -> [String] -> Fixity -> Constr
 mkConstrTag dt str idx fields fix =
         Constr