diff -r 21076e24cd8a Doc/library/tkinter.rst
--- a/Doc/library/tkinter.rst   Sat Sep 19 13:39:03 2015 +0200
+++ b/Doc/library/tkinter.rst   Sat Sep 19 22:33:28 2015 +0300
@@ -13,6 +13,9 @@
 installed on your system by running ``python -m tkinter`` from the command line;
 this should open a window demonstrating a simple Tk interface.
 
+.. note::
+   Since Python 3, :mod:`tkinter` no longer starts with a capital 'T'.
+
 .. seealso::
 
    `Python Tkinter Resources <https://wiki.python.org/moin/TkInter>`_