Describe the default_namespace parameter of ElemetTree.write.
diff --git a/Lib/xml/etree/ElementTree.py b/Lib/xml/etree/ElementTree.py
index d8ec67a..cd33cd0 100644
--- a/Lib/xml/etree/ElementTree.py
+++ b/Lib/xml/etree/ElementTree.py
@@ -779,11 +779,12 @@
     # @param file A file name, or a file object opened for writing.
     # @param **options Options, given as keyword arguments.
     # @keyparam encoding Optional output encoding (default is US-ASCII).
-    # @keyparam method Optional output method ("xml", "html", "text" or
-    #     "c14n"; default is "xml").
     # @keyparam 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.  None is default.
+    # @keyparam default_namespace Sets the default XML namespace (for "xmlns").
+    # @keyparam method Optional output method ("xml", "html", "text" or
+    #     "c14n"; default is "xml").
 
     def write(self, file_or_filename,
               # keyword arguments