diff --git a/src/dispatcher.h b/src/dispatcher.h
index c2309b6..1bea184 100644
--- a/src/dispatcher.h
+++ b/src/dispatcher.h
@@ -50,7 +50,9 @@
              , const std::string &sharedFolder
              , const boost::filesystem::path &rootDir
              , Ccnx::CcnxWrapperPtr ccnx
-             , int poolSize = 2);
+             , int poolSize = 2
+             , bool enablePrefixDiscovery = true
+             );
   ~Dispatcher();
 
   // ----- Callbacks, they only submit the job to executor and immediately return so that event processing thread won't be blocked for too long -------
@@ -63,6 +65,10 @@
   void
   Did_LocalFile_Delete (const boost::filesystem::path &relativeFilepath);
 
+  // for test
+  HashPtr
+  SyncRoot() { return m_core->root(); }
+
 private:
   void
   Did_LocalFile_AddOrModify_Execute (boost::filesystem::path relativeFilepath); // cannot be const & for Execute event!!! otherwise there will be segfault
@@ -156,6 +162,7 @@
 
   std::string m_sharedFolder;
   ContentServer *m_server;
+  bool m_enablePrefixDiscovery;
 
   FetchManagerPtr m_actionFetcher;
   FetchManagerPtr m_fileFetcher;