--- a/src/contrib/delay-jitter-estimation.h	Tue Dec 11 17:48:09 2007 +0100
+++ b/src/contrib/delay-jitter-estimation.h	Tue Dec 11 17:53:54 2007 +0100
@@ -6,14 +6,45 @@
 
 namespace ns3 {
 
+/**
+ * \brief quick and diry delay and jitter estimation
+ *
+ */
 class DelayJitterEstimation
 {
 public:
   DelayJitterEstimation ();
+
+  /**
+   * \param packet the packet to send over a wire
+   *
+   * This method should be invoked once on each packet to
+   * record within the packet the tx time which is used upon
+   * packet reception to calculate the delay and jitter. The
+   * tx time is stored in the packet as an ns3::Tag which means
+   * that it does not use any network ressources and is not
+   * taken into account in transmission delay calculations.
+   */
   static void PrepareTx (Ptr<const Packet> packet);
+  /**
+   * \param packet the packet received
+   *
+   * Invoke this method to update the delay and jitter calculations
+   * After a call to this method, \ref GetLastDelay and \ref GetLastJitter
+   * will return an updated delay and jitter.
+   */
   void RecordRx (Ptr<const Packet> packet);
 
+  /**
+   * \returns the updated delay.
+   */
   Time GetLastDelay (void) const;
+  /**
+   * The jitter is calculated using the RFC 1889 (RTP) jitter
+   * definition.
+   *
+   * \returns the updated jitter.
+   */
   Time GetLastJitter (void) const;
 
 private:

--- a/src/contrib/wscript	Tue Dec 11 17:48:09 2007 +0100
+++ b/src/contrib/wscript	Tue Dec 11 17:53:54 2007 +0100
@@ -5,10 +5,12 @@
     module.source = [
         'event-garbage-collector.cc',
         'gnuplot.cc',
+        'delay-jitter-estimation.cc',
         ]
 
     headers = bld.create_obj('ns3header')
     headers.source = [
         'event-garbage-collector.h',
         'gnuplot.h',
+        'delay-jitter-estimation.h',
         ]