diff --git a/Misc/NEWS b/Misc/NEWS
index 5ee1962..39a45fc 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -393,6 +393,9 @@
 Library
 -------
 
+- Issue #8729: Return NotImplemented from collections.Mapping.__eq__ when
+  comparing to a non-mapping.
+
 - Issue #8774: tabnanny uses the encoding cookie (#coding:...) to use the
   correct encoding