Mention itertools.accumulate().
diff --git a/Doc/whatsnew/3.2.rst b/Doc/whatsnew/3.2.rst
index 6e1daf9..3c913a1 100644
--- a/Doc/whatsnew/3.2.rst
+++ b/Doc/whatsnew/3.2.rst
@@ -405,7 +405,8 @@
>>> get_phone_number.cache_clear()
- (Contributed by Raymond Hettinger.)
+ (Contributed by Raymond Hettinger and incorporating design ideas from
+ Jim Baker, Miki Tebeka, and Nick Coglan.)
* The :func:`functools.wraps` decorator now adds a :attr:`__wrapped__` attribute
pointing to the original callable function. This allows wrapped functions to
@@ -416,6 +417,22 @@
(By Nick Coghlan and Terrence Cole; :issue:`9567`, :issue:`3445`, and
:issue:`8814`.)
+* The :mod:`itertools` module has a new function, :func:`~itertools.accumulate`
+ modeled on APL's *scan* and on Numpy's *accumulate* function:
+
+ >>> list(accumulate(8, 2, 50))
+ [8, 10, 60]
+
+ >>> prob_dist = [0.1, 0.4, 0.2, 0.3]
+ >>> list(accumulate(prob_dist)) # cumulative probability distribution
+ [0.1, 0.5, 0.7, 1.0]
+
+ For an example using :func:`~itertools.accumulate`, see the :ref:`examples for
+ the random module <random-examples>`.
+
+ (Contributed by Raymond Hettinger and incorporating design suggestions
+ from Mark Dickinson.)
+
* The :mod:`nntplib` module gets a revamped implementation with better
bytes / unicode semantics as well as more practical APIs. These improvements
break compatibility with the nntplib version in Python 3.1, which was