Improved explanation of what's here
diff --git a/Demo/tkinter/README b/Demo/tkinter/README
index 0cb8528..42af79c 100644
--- a/Demo/tkinter/README
+++ b/Demo/tkinter/README
@@ -1,2 +1,12 @@
-The subdirectory "guido" contains my original example set.
-A more interesting and coherent collection is in the subdirectory "matt".
+Several collections of example code for Tkinter.
+
+See the toplevel README for an explanation of the difference between
+Tkinter and tkinter, how to enable the Python Tk interface, and where
+to get Matt Conway's lifesaver document.
+
+Subdirectories:
+
+guido my original example set (fairly random collection)
+matt Matt Conway's examples, to go with his lifesaver document
+www a progressing sequence of www clients using Tk
+howard some dialogs contributed by Ken Howard