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 f52d5ae29d3a97febed2e96a1c7bcecdad7508b7..974cc7130289343da34752e9db5f4370c157be0c 100644 (file)
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -1484,9 +1484,11 @@ Major performance enhancements have been added:
   * 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`.)
 
 
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