Add cross-references to the glossary entry for file objects.
diff --git a/Doc/library/aifc.rst b/Doc/library/aifc.rst
index bdd3517..304437d 100644
--- a/Doc/library/aifc.rst
+++ b/Doc/library/aifc.rst
@@ -40,10 +40,10 @@
.. function:: open(file, mode=None)
Open an AIFF or AIFF-C file and return an object instance with methods that are
- described below. The argument *file* is either a string naming a file or a file
- object. *mode* must be ``'r'`` or ``'rb'`` when the file must be opened for
- reading, or ``'w'`` or ``'wb'`` when the file must be opened for writing. If
- omitted, ``file.mode`` is used if it exists, otherwise ``'rb'`` is used. When
+ described below. The argument *file* is either a string naming a file or a
+ :term:`file object`. *mode* must be ``'r'`` or ``'rb'`` when the file must be
+ opened for reading, or ``'w'`` or ``'wb'`` when the file must be opened for writing.
+ If omitted, ``file.mode`` is used if it exists, otherwise ``'rb'`` is used. When
used for writing, the file object should be seekable, unless you know ahead of
time how many samples you are going to write in total and use
:meth:`writeframesraw` and :meth:`setnframes`.