diff --git a/rib/readvertise/readvertise-destination.hpp b/rib/readvertise/readvertise-destination.hpp
index b31e6f0..204d2b6 100644
--- a/rib/readvertise/readvertise-destination.hpp
+++ b/rib/readvertise/readvertise-destination.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014-2016,  Regents of the University of California,
+ * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -50,6 +50,25 @@
   withdraw(nfd::rib::ReadvertisedRoute& rr,
            std::function<void()> successCb,
            std::function<void(const std::string&)> failureCb) = 0;
+
+  bool
+  isAvailable() const
+  {
+    return m_isAvailable;
+  };
+
+protected:
+  void
+  setAvailability(bool isAvailable);
+
+public:
+  /** \brief signals when the destination becomes available or unavailable
+   */
+  ndn::util::signal::Signal<ReadvertiseDestination, bool>
+  afterAvailabilityChange;
+
+private:
+  bool m_isAvailable = false;
 };
 
 } // namespace rib