Mention enum as an ex (#2982)
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 5f932ae..31a7671 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1896,8 +1896,8 @@
^^^^^^^^^^^^^^^^^
The potential uses for metaclasses are boundless. Some ideas that have been
-explored include logging, interface checking, automatic delegation, automatic
-property creation, proxies, frameworks, and automatic resource
+explored include enum, logging, interface checking, automatic delegation,
+automatic property creation, proxies, frameworks, and automatic resource
locking/synchronization.
Here is an example of a metaclass that uses an :class:`collections.OrderedDict`