diff --git a/include/fmt/base.h b/include/fmt/base.h
index 9fba386a..d044f1cf 100644
--- a/include/fmt/base.h
+++ b/include/fmt/base.h
@@ -1030,6 +1030,7 @@ struct is_view : std::false_type {};
 template <typename T>
 struct is_view<T, bool_constant<sizeof(T) != 0>> : std::is_base_of<view, T> {};
 
+// DEPRECATED! named_arg will be moved to the fmt namespace.
 template <typename T, typename Char> struct named_arg;
 template <typename T> struct is_named_arg : std::false_type {};
 template <typename T> struct is_static_named_arg : std::false_type {};