Clarify some __del__ stuff.
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index dbcc9a1..5b6f1e8 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1257,7 +1257,9 @@
is printed to ``sys.stderr`` instead. Also, when :meth:`__del__` is invoked in
response to a module being deleted (e.g., when execution of the program is
done), other globals referenced by the :meth:`__del__` method may already have
- been deleted. For this reason, :meth:`__del__` methods should do the absolute
+ been deleted or in the process of being torn down (e.g. the import
+ machinery shutting down). For this reason, :meth:`__del__` methods
+ should do the absolute
minimum needed to maintain external invariants. Starting with version 1.5,
Python guarantees that globals whose name begins with a single underscore are
deleted from their module before other globals are deleted; if no other