allow __dir__ to return any sequence
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 129f987..e628a02 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1343,7 +1343,8 @@
.. method:: object.__dir__(self)
- Called when :func:`dir` is called on the object. A list must be returned.
+ Called when :func:`dir` is called on the object. A sequence must be
+ returned. :func:`dir` converts the returned sequence to a list and sorts it.
.. _descriptors: