diff --git a/include/fmt/core.h b/include/fmt/core.h
index f6886cf4..93ac158f 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -1660,6 +1660,7 @@ template <typename Context> class basic_format_arg {
   ``vis(value)`` will be called with the value of type ``double``.
   \endrst
  */
+// DEPRECATED!
 FMT_EXPORT
 template <typename Visitor, typename Context>
 FMT_CONSTEXPR FMT_INLINE auto visit_format_arg(