merge 3.1
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index 72f93be..5bb128b 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -354,8 +354,8 @@
for a complete list of code points with the ``Nd`` property.
-All :class:`numbers.Real` types (:class:`int` and
-:class:`float`) also include the following operations:
+All :class:`numbers.Real` types (:class:`int` and :class:`float`) also include
+the following operations:
+--------------------+------------------------------------+--------+
| Operation | Result | Notes |
@@ -439,6 +439,9 @@
Additional Methods on Integer Types
-----------------------------------
+The int type implements the :class:`numbers.Integral` :term:`abstact base
+class`. In addition, it provides one more method
+
.. method:: int.bit_length()
Return the number of bits necessary to represent an integer in binary,
@@ -532,7 +535,8 @@
Additional Methods on Float
---------------------------
-The float type has some additional methods.
+The float type implements the :class:`numbers.Real` :term:`abstract base
+class`. float also has the following additional methods.
.. method:: float.as_integer_ratio()