diff --git a/task1/mergesort.h b/task1/mergesort.h
index 18377aa..ecd942a 100644
--- a/task1/mergesort.h
+++ b/task1/mergesort.h
@@ -83,6 +83,13 @@ namespace algo {
 
     class MergeSort_v2 {
     private:
+
+        template<typename Iterator, typename Comparator>
+        static auto
+        mt_merge() {
+
+        }
+
         template<typename Iterator, typename Comparator>
         static auto
         merge(Iterator start, Iterator middle, Iterator end, Comparator cmp, Iterator output_start, std::recursive_mutex &dataset_guard) -> void {