Clarify ET.iterparse documentation - this function is not supported by the
C implementation.
diff --git a/Doc/library/xml.etree.elementtree.rst b/Doc/library/xml.etree.elementtree.rst
index d9b0a52..d320711 100644
--- a/Doc/library/xml.etree.elementtree.rst
+++ b/Doc/library/xml.etree.elementtree.rst
@@ -101,8 +101,9 @@
and ``"end-ns"`` (the "ns" events are used to get detailed namespace
information). If *events* is omitted, only ``"end"`` events are reported.
*parser* is an optional parser instance. If not given, the standard
- :class:`XMLParser` parser is used. Returns an :term:`iterator` providing
- ``(event, elem)`` pairs.
+ :class:`XMLParser` parser is used. *parser* is not supported by
+ ``cElementTree``. Returns an :term:`iterator` providing ``(event, elem)``
+ pairs.
.. note::