Add notes that tkinter modules will be renamed.
diff --git a/Doc/glossary.rst b/Doc/glossary.rst
index 8ce622d..0da14d8 100644
--- a/Doc/glossary.rst
+++ b/Doc/glossary.rst
@@ -16,6 +16,14 @@
The typical Python prompt of the interactive shell when entering code for
an indented code block.
+ 2to3
+ A tool that tries to convert Python 2.x code to Python 3.x code by
+ handling most of the incompatibilites that can be detected by parsing the
+ source and traversing the parse tree.
+
+ 2to3 is available in the standard library as :mod:`lib2to3`; a standalone
+ entry point is provided as :file:`Tools/scripts/2to3`.
+
argument
A value passed to a function or method, assigned to a name local to
the body. A function or method may have both positional arguments and