bpo-42560: add warning to Tkinter docs about outdated pre-8.5 documentation online...

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Co-authored-by: E-Paine <63801254+E-Paine@users.noreply.github.com>

diff --git a/Doc/library/tkinter.rst b/Doc/library/tkinter.rst
index 425f030dcc983f6c50ed3320e44afa1093979a6a..c106cb8328c206052350df2790fd0ee04db6f885 100644 (file)
--- a/Doc/library/tkinter.rst
+++ b/Doc/library/tkinter.rst
@@ -29,6 +29,13 @@ make the experience more pythonic. This documentation will concentrate on these
 additions and changes, and refer to the official Tcl/Tk documentation for
 details that are unchanged.
 
+.. note::
+
+   Tcl/Tk 8.5 (2007) introduced a modern set of themed user interface components
+   along with a new API to use them. Both old and new APIs are still available.
+   Most documentation you will find online still uses the old API and
+   can be woefully outdated.
+
 .. seealso::
 
    * `TkDocs <http://tkdocs.com/>`_