Add cross-references to the glossary entry for file objects.
diff --git a/Doc/library/weakref.rst b/Doc/library/weakref.rst
index c8eb899..dec415c 100644
--- a/Doc/library/weakref.rst
+++ b/Doc/library/weakref.rst
@@ -58,8 +58,9 @@
Not all objects can be weakly referenced; those objects which can include class
instances, functions written in Python (but not in C), instance methods, sets,
-frozensets, file objects, :term:`generator`\s, type objects, sockets, arrays,
-deques, regular expression pattern objects, and code objects.
+frozensets, some :term:`file objects <file object>`, :term:`generator`\s, type
+objects, sockets, arrays, deques, regular expression pattern objects, and code
+objects.
.. versionchanged:: 3.2
Added support for thread.lock, threading.Lock, and code objects.