Forward merge of r67822 to py3k: add bit_length method to int.
diff --git a/Doc/whatsnew/3.1.rst b/Doc/whatsnew/3.1.rst
index a244568..7df4d1e 100644
--- a/Doc/whatsnew/3.1.rst
+++ b/Doc/whatsnew/3.1.rst
@@ -66,4 +66,26 @@
.. ======================================================================
+Other Language Changes
+======================
+
+Some smaller changes made to the core Python language are:
+
+* The :func:`int` type gained a ``bit_length`` method that returns the
+ number of bits necessary to represent its argument in binary::
+
+ >>> n = 37
+ >>> bin(37)
+ '0b100101'
+ >>> n.bit_length()
+ 6
+ >>> n = 2**123-1
+ >>> n.bit_length()
+ 123
+ >>> (n+1).bit_length()
+ 124
+
+ (Contributed by Fredrik Johansson and Victor Stinner; :issue:`3439`.)
+
+
.. ======================================================================