Issue #16688: Fix backreferences did make case-insensitive regex fail on non-ASCII strings.
Patch by Matthew Barnett.
diff --git a/Misc/NEWS b/Misc/NEWS
index 2a22bb5..c2bfa00 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -124,6 +124,9 @@
 Library
 -------
 
+- Issue #16688: Fix backreferences did make case-insensitive regex fail on
+  non-ASCII strings. Patch by Matthew Barnett.
+
 - Issue #16485: Fix file descriptor not being closed if file header patching
   fails on closing of aifc file.