Mention the UTF-16 encoding speedup in the whatsnew (issue #15026).
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index f52d5ae..974cc71 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -1484,9 +1484,11 @@
* repeating a single ASCII letter and getting a substring of a ASCII strings
is 4 times faster
-* UTF-8 and UTF-16 decoding is now 2x to 4x faster.
+* UTF-8 and UTF-16 decoding is now 2x to 4x faster. UTF-16 encoding is now
+ up to 10x faster.
- (contributed by Serhiy Storchaka, :issue:`14624` and :issue:`14738`.)
+ (contributed by Serhiy Storchaka, :issue:`14624`, :issue:`14738` and
+ :issue:`15026`.)
Build and C API Changes