diff --git a/daemon/fw/forwarder.hpp b/daemon/fw/forwarder.hpp
index d2a5eb8..48614f6 100644
--- a/daemon/fw/forwarder.hpp
+++ b/daemon/fw/forwarder.hpp
@@ -46,6 +46,8 @@
 class Strategy;
 } // namespace fw
 
+class NullFace;
+
 /** \brief main class of NFD
  *
  *  Forwarder owns all faces and tables, and implements forwarding pipelines.
@@ -129,6 +131,17 @@
   void
   setCsFromNdnSim(ns3::Ptr<ns3::ndn::ContentStore> cs);
 
+public:
+  /** \brief trigger before PIT entry is satisfied
+   *  \sa Strategy::beforeSatisfyInterest
+   */
+  signal::Signal<Forwarder, pit::Entry, Face, Data> beforeSatisfyInterest;
+
+  /** \brief trigger before PIT entry expires
+   *  \sa Strategy::beforeExpirePendingInterest
+   */
+  signal::Signal<Forwarder, pit::Entry> beforeExpirePendingInterest;
+
 PUBLIC_WITH_TESTS_ELSE_PRIVATE: // pipelines
   /** \brief incoming Interest pipeline
    */
@@ -244,6 +257,7 @@
   StrategyChoice     m_strategyChoice;
   DeadNonceList      m_deadNonceList;
   NetworkRegionTable m_networkRegionTable;
+  shared_ptr<Face>   m_csFace;
 
   ns3::Ptr<ns3::ndn::ContentStore> m_csFromNdnSim;