diff --git a/model/pit/ndn-pit-entry-impl.h b/model/pit/ndn-pit-entry-impl.h
index 85c94f1..6af9cc5 100644
--- a/model/pit/ndn-pit-entry-impl.h
+++ b/model/pit/ndn-pit-entry-impl.h
@@ -62,6 +62,15 @@
     CONTAINER.RescheduleCleaning ();
   }
 
+  virtual void
+  OffsetLifetime (const Time &offsetTime)
+  {
+    CONTAINER.i_time.erase (Pit::time_index::s_iterator_to (*this));
+    super::OffsetLifetime (offsetTime);
+    CONTAINER.i_time.insert (*this);
+
+    CONTAINER.RescheduleCleaning ();
+  }
   
   // to make sure policies work
   void
diff --git a/model/pit/ndn-pit-entry.cc b/model/pit/ndn-pit-entry.cc
index 4dcf6d0..af66570 100644
--- a/model/pit/ndn-pit-entry.cc
+++ b/model/pit/ndn-pit-entry.cc
@@ -70,6 +70,18 @@
   NS_LOG_INFO ("Updated lifetime to " << m_expireTime.ToDouble (Time::S));
 }
 
+void
+Entry::OffsetLifetime (const Time &offsetTime)
+{
+  m_expireTime += offsetTime;
+  if (m_expireTime < Simulator::Now ())
+    {
+      m_expireTime = Simulator::Now ();
+    }
+  NS_LOG_INFO ("Offsetting lifetime to " << m_expireTime.ToDouble (Time::S));
+}
+
+
 const NameComponents &
 Entry::GetPrefix () const
 {
diff --git a/model/pit/ndn-pit-entry.h b/model/pit/ndn-pit-entry.h
index ecec2a6..7f4ef0e 100644
--- a/model/pit/ndn-pit-entry.h
+++ b/model/pit/ndn-pit-entry.h
@@ -119,12 +119,21 @@
    * This function will update PIT entry lifetime to the maximum of the current lifetime and
    * the lifetime Simulator::Now () + offsetTime
    *
-   * @param offsetTime Relative time to the current moment, representing PIT entry lifetime
+   * @param lifetime Relative time to the current moment, representing PIT entry lifetime
    */
   virtual void
-  UpdateLifetime (const Time &offsetTime);
+  UpdateLifetime (const Time &lifetime);
 
   /**
+   * @brief Offset the currently set PIT lifetime (allowed both negative and positive offsets)
+   * @param offsetTime positive or negative offset for the PIT lifetime.
+   *
+   * If PIT expire time becomes less than Simulator::Now, then it is adjusted to Simulator::Now.
+   */
+  virtual void
+  OffsetLifetime (const Time &offsetTime);
+  
+  /**
    * @brief Get prefix of the PIT entry
    */
   const NameComponents &