Added some reminders.

Doc/TODO

@@ -36,5 +36,12 @@ PYTHON DOCUMENTATION TO-DO LIST			-*- indented-text -*-
 
 * Figure out HTMLHelp generation for the Windows world.
 
-* Before next Python release, document that the mode parameter to
-  wave.open() may be omitted, and how it is determined if omitted.
+
+BEFORE NEXT PYTHON RELEASE, BUT NOT UNTIL THEN:
+
+* Document that the mode parameter to wave.open() may be omitted, and
+  how it is determined if omitted.  (Same of aifc, sunau open()
+  functions.)
+
+* Document that fpformat.NotANumber is a subclass of ValueError, has
+  the string that failed as the "exception value".