Describe the default_namespace parameter of ElemetTree.write.
diff --git a/Doc/library/xml.etree.elementtree.rst b/Doc/library/xml.etree.elementtree.rst
index 458f746..9ce781e 100644
--- a/Doc/library/xml.etree.elementtree.rst
+++ b/Doc/library/xml.etree.elementtree.rst
@@ -767,13 +767,15 @@
root element.
- .. method:: write(file, encoding="us-ascii", xml_declaration=None, method="xml")
+ .. method:: write(file, encoding="us-ascii", xml_declaration=None, \
+ default_namespace=None, method="xml")
Writes the element tree to a file, as XML. *file* is a file name, or a
file object opened for writing. *encoding* [1]_ is the output encoding
(default is US-ASCII). *xml_declaration* controls if an XML declaration
should be added to the file. Use False for never, True for always, None
- for only if not US-ASCII or UTF-8 (default is None). *method* is either
+ for only if not US-ASCII or UTF-8 (default is None). *default_namespace*
+ sets the default XML namespace (for "xmlns"). *method* is either
``"xml"``, ``"html"`` or ``"text"`` (default is ``"xml"``). Returns an
encoded string.