diff --git a/src/storage/repo-storage.hpp b/src/storage/repo-storage.hpp
index bf3ade8..ec5faa7 100644
--- a/src/storage/repo-storage.hpp
+++ b/src/storage/repo-storage.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2017,  Regents of the University of California.
+/*
+ * Copyright (c) 2014-2018, Regents of the University of California.
  *
  * This file is part of NDN repo-ng (Next generation of NDN repository).
  * See AUTHORS.md for complete list of repo-ng authors and contributors.
@@ -90,6 +90,10 @@
   std::shared_ptr<Data>
   readData(const Interest& interest) const;
 
+private:
+  void
+  insertItemToIndex(const Storage::ItemMeta& item);
+
 public:
   ndn::util::Signal<RepoStorage, ndn::Name> afterDataInsertion;
   ndn::util::Signal<RepoStorage, ndn::Name> afterDataDeletion;