diff --git a/src/clients/response.hpp b/src/clients/response.hpp
index a33e42a..a97fb76 100644
--- a/src/clients/response.hpp
+++ b/src/clients/response.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 NDNS (Named Data Networking Domain Name Service).
  * See AUTHORS.md for complete list of NDNS authors and contributors.
@@ -40,7 +40,7 @@
 /**
  * @brief Default life time of resource record
  */
-const time::seconds DEFAULT_RR_FRESHNESS_PERIOD(3600);
+const time::seconds DEFAULT_RR_FRESHNESS_PERIOD = 3600_s;
 
 
 /**
@@ -50,6 +50,12 @@
 class Response
 {
 public:
+  class Error : public ndn::tlv::Error
+  {
+  public:
+    using ndn::tlv::Error::Error;
+  };
+
   Response();
 
   Response(const Name& zone, const name::Component& queryType);
@@ -112,6 +118,9 @@
   size_t
   wireEncode(EncodingImpl<T>& block) const;
 
+  static std::pair<Name, Name>
+  wireDecodeDoe(const Block& wire);
+
 public:
   ///////////////////////////////////////////////
   // getter and setter