Add build_py_2to3.
diff --git a/Doc/distutils/apiref.rst b/Doc/distutils/apiref.rst
index 36684e2..6616f83 100644
--- a/Doc/distutils/apiref.rst
+++ b/Doc/distutils/apiref.rst
@@ -1820,7 +1820,25 @@
:synopsis: Build the .py/.pyc files of a package
-.. % todo
+.. class:: build_py(Command)
+
+.. class:: build_py_2to3(build_py)
+
+ Alternative implementation of build_py which also runs the
+ 2to3 conversion library on each .py file that is going to be
+ installed. To use this in a setup.py file for a distribution
+ that is designed to run with both Python 2.x and 3.x, add::
+
+ try:
+ from distutils.command.build_py import build_py_2to3 as build_py
+ except ImportError:
+ from distutils.command.build_py import build_py
+
+ to your setup.py, and later::
+
+ cmdclass = {'build_py':build_py}
+
+ to the invocation of setup().
:mod:`distutils.command.build_scripts` --- Build the scripts of a package