Improved PanedWindow.add's docstring. 'subcomand' is a Tcl term, and the possible options and values are the same accepted by paneconfigure (not configure).
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 3cce276..4f80ede 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -3550,8 +3550,8 @@
The child argument is the name of the child widget
followed by pairs of arguments that specify how to
- manage the windows. Options may have any of the values
- accepted by the configure subcommand.
+ manage the windows. The possible options and values
+ are the ones accepted by the paneconfigure method.
"""
self.tk.call((self._w, 'add', child) + self._options(kw))