Add a precision on stats to the porting guide.

axis=0 for multiobjective. --HG-- branch : dev
zhz125 · Feb 17, 2014 · c5798db · c5798db
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commit c5798db
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diff --git a/doc/porting.rst b/doc/porting.rst
@@ -15,6 +15,8 @@ General
 #. Statistics and logging of data are accomplished by two distinct objects: :class:`~deap.tools.Statistics` and :class:`~deap.tools.Logbook`. Read the tutorial on :doc:`logging statistics <tutorials/basic/part3>`. 
 #. Replace :class:`~deap.tools.EvolutionLogger` by :class:`~deap.tools.Logbook`.
 #. Replace usage of :func:`tools.mean`, :func:`tools.var`, :func:`tools.std`, and :func:`tools.median` by their Numpy equivalent.
+#. If the fitness has multiple objectives, add the keyword argument ``axis=0`` when registering statistical function.
+#. 
 
 Genetic Algorithms (GA)
 =======================