Fix credits for math.sum()
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`.