Document the -J and -X options for CPython. Note that unlike for py2k, we
don't need to document -U becuase it's gone in py3k.
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 7c9b511..540e4d7 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -238,8 +238,6 @@
See also :envvar:`PYTHONUNBUFFERED`.
-.. XXX should the -U option be documented?
-
.. cmdoption:: -v
Print a message each time a module is initialized, showing the place
@@ -315,6 +313,20 @@
.. note:: The line numbers in error messages will be off by one.
+Options you shouldn't use
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. cmdoption:: -J
+
+ Reserved for use by Jython_.
+
+.. _Jython: http://jython.org
+
+.. cmdoption:: -X
+
+ Reserved for alternative implementations of Python to use for their own
+ purposes.
+
.. _using-on-envvars:
Environment variables