Issue #13121: Support in-place math operators for collections.Counter().
diff --git a/Misc/NEWS b/Misc/NEWS
index 8774334..cd6747e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -488,6 +488,7 @@
   in os.kill().
 
 - Add support for unary plus and unary minus to collections.Counter().
+  Issue #13121: Also an support for inplace math operators.
 
 - Issue #12683: urlparse updated to include svn as schemes that uses relative
   paths. (svn from 1.5 onwards support relative path).