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diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
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@@ -852,6 +852,10 @@ Equality tests between :class:`OrderedDict` objects and other
This allows :class:`OrderedDict` objects to be substituted anywhere a
regular dictionary is used.
+The :class:`OrderedDict` constructor and :meth:`update` method both accept
+keyword arguments, but their order is lost because Python's function call
+semantics pass-in keyword arguments using a regular unordered dictionary.
+
.. seealso::
`Equivalent OrderedDict recipe <http://code.activestate.com/recipes/576693/>`_