--- a/src/contrib/flow-monitor/histogram.h	Thu Jul 16 14:58:57 2009 +0100
+++ b/src/contrib/flow-monitor/histogram.h	Thu Jul 16 16:03:59 2009 +0100
@@ -49,6 +49,9 @@
 
   void SerializeToXmlStream (std::ostream &os, int indent, std::string elementName) const;
 
+  // TODO: add method(s) to estimate N, µ, and s² from the histogram,
+  // see http://www.dspguide.com/ch2/4.htm
+
 private:
   std::vector<uint32_t> m_histogram;
   double m_binWidth;