Document tix directory.
diff --git a/Demo/README b/Demo/README
index 87017a9..49f8559 100644
--- a/Demo/README
+++ b/Demo/README
@@ -46,3 +46,5 @@
 
 tkinter		Demos using the Tk interface (including Matt Conway's
 		excellent set of demos).
+
+tix		Demos using the Tix widget set addition to Tkinter.
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