diff --git a/include/utempl/meta_info.hpp b/include/utempl/meta_info.hpp
index 44ef97a..3117beb 100644
--- a/include/utempl/meta_info.hpp
+++ b/include/utempl/meta_info.hpp
@@ -11,28 +11,26 @@ struct Types {};
 } // namespace impl
 
 
-template <std::size_t Id>
-struct MetaInfoKey {
-
-};
+template <std::size_t Id, typename Tag>
+struct MetaInfoKey {};
 
 
-template <typename T>
+template <typename T, typename Tag = impl::Types>
 struct MetaInfo {
-  static constexpr std::size_t kTypeId = loopholes::Counter<impl::Types, T>();
+  static constexpr std::size_t kTypeId = loopholes::Counter<Tag, T>();
   using Type = T;
 private: 
-  static constexpr auto _ = loopholes::Injector<MetaInfoKey<kTypeId>{}, TypeList<T>{}>{};
+  static constexpr auto _ = loopholes::Injector<MetaInfoKey<kTypeId, Tag>{}, TypeList<T>{}>{};
 
 };
 
-template <typename T>
-inline constexpr std::size_t kTypeId = MetaInfo<T>::kTypeId;
+template <typename T, typename Tag = impl::Types>
+inline constexpr std::size_t kTypeId = MetaInfo<T, Tag>::kTypeId;
 
-template <std::size_t Id>
-using GetMetaInfo = MetaInfo<typename decltype(Magic(loopholes::Getter<MetaInfoKey<Id>{}>{}))::Type>;
+template <std::size_t Id, typename Tag = impl::Types>
+using GetMetaInfo = MetaInfo<typename decltype(Magic(loopholes::Getter<MetaInfoKey<Id, Tag>{}>{}))::Type>;
 
-template <std::size_t Id>
-using GetType = GetMetaInfo<Id>::Type;
+template <std::size_t Id, typename Tag = impl::Types>
+using GetType = GetMetaInfo<Id, Tag>::Type;
 
 } // namespace utempl