- The functional API gets a keyword-only `module` argument.

- Spell it 'mix-in'
- Clarify "behavior only"

pep-0435.txt

@@ -410,11 +410,12 @@ a ``StrEnum`` that mixes in ``str`` instead of ``int``.
 
 Some rules:
 
-1. When subclassing Enum, mixing types must appear before Enum itself in the
+1. When subclassing Enum, mix-in types must appear before Enum itself in the
-   sequence of bases.
+   sequence of bases, as in the ``IntEnum`` example above.
 2. While Enum can have members of any type, once you mix in an additional
    type, all the members must have values of that type, e.g. ``int`` above.
-   This restriction does not apply to behavior-only mixins.
+   This restriction does not apply to mix-ins which only add methods
+   and don't specify another data type such as ``int`` or ``str``.
 
 
 Functional API
@@ -432,12 +433,12 @@ The ``Enum`` class is callable, providing the following functional API::
     >>> list(Animal)
     [<Animal.ant: 1>, <Animal.bee: 2>, <Animal.cat: 3>, <Animal.dog: 4>]
 
-The semantics of this API resemble ``namedtuple``. The first argument of
+The semantics of this API resemble ``namedtuple``. The first argument
-the call to ``Enum`` is the name of the enumeration.  This argument
+of the call to ``Enum`` is the name of the enumeration.  To support
-can be the short name of the enum or a dotted-name including the
+pickling of these enums, the module name can be specified using the
-module path to better support pickling.  E.g.::
+``module`` keyword-only argument.  E.g.::
 
-    >>> Animals = Enum('animals.Animals', 'ant bee cat dog')
+    >>> Animals = Enum('Animals', 'ant bee cat dog', module=__name__)
 
 The second argument is the *source* of enumeration member names.  It can be a
 whitespace-separated string of names, a sequence of names, a sequence of