-but are currently undocumented. Use them at your own risk, as the
-interfaces are subject to change.
+but are currently undocumented. Use them at your own risk, as the
+interfaces are subject to change. Functions that are not listed in this
+document are not intended for public use, and should NOT be used under any
+circumstances.
+
+If you feel you need to use one of these functions, first send email to
+L<perl5-porters@perl.org|mailto:perl5-porters@perl.org>. It may be
+that there is a good reason for the function not being documented, and it
+should be removed from this list; or it may just be that no one has gotten
+around to documenting it. In the latter case, you will be asked to submit a
+patch to document the function. Once your patch is accepted, it will indicate
+that the interface is stable (unless it is explicitly marked otherwise) and
+usable by you.
+
+=over