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diff --git a/Doc/whatsnew/3.5.rst b/Doc/whatsnew/3.5.rst
index aa5af04..0996350 100644
--- a/Doc/whatsnew/3.5.rst
+++ b/Doc/whatsnew/3.5.rst
@@ -454,6 +454,9 @@ zipfile
* Added support for writing ZIP files to unseekable streams.
(Contributed by Serhiy Storchaka in :issue:`23252`.)
+* The :func:`zipfile.ZipFile.open` function now supports ``'x'`` (exclusive
+ creation) mode. (Contributed by Serhiy Storchaka in :issue:`21717`.)
+
Optimizations
=============