diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst
index f895f80..a47bc00 100644
--- a/Doc/whatsnew/2.6.rst
+++ b/Doc/whatsnew/2.6.rst
@@ -1539,7 +1539,8 @@
 
   * :func:`~math.sum` adds up the stream of numbers from an iterable,
     and is careful to avoid loss of precision by calculating partial sums.
-    (Contributed by Jean Brouwers; :issue:`2819`.)
+    (Contributed by Jean Brouwers, Raymond Hettinger, and Mark Dickinson;
+    :issue:`2819`.)
 
   * The inverse hyperbolic functions :func:`~math.acosh`, :func:`~math.asinh`
     and :func:`~math.atanh`.