Add cross-references to the glossary entry for file objects.
diff --git a/Doc/library/select.rst b/Doc/library/select.rst
index 5418093..5e848b0 100644
--- a/Doc/library/select.rst
+++ b/Doc/library/select.rst
@@ -78,11 +78,12 @@
single: socket() (in module socket)
single: popen() (in module os)
- Among the acceptable object types in the sequences are Python file objects (e.g.
- ``sys.stdin``, or objects returned by :func:`open` or :func:`os.popen`), socket
- objects returned by :func:`socket.socket`. You may also define a :dfn:`wrapper`
- class yourself, as long as it has an appropriate :meth:`fileno` method (that
- really returns a file descriptor, not just a random integer).
+ Among the acceptable object types in the sequences are Python :term:`file
+ objects <file object>` (e.g. ``sys.stdin``, or objects returned by
+ :func:`open` or :func:`os.popen`), socket objects returned by
+ :func:`socket.socket`. You may also define a :dfn:`wrapper` class yourself,
+ as long as it has an appropriate :meth:`fileno` method (that really returns
+ a file descriptor, not just a random integer).
.. note::