Ticket #3137: session_docs.diff

docs/sessions.txt

@@ -23 +23 @@
       run ``manage.py syncdb`` to install the single database table that stores
       session data.
 
+Note that the ``django_session`` table will not purge itself of expired
+sessions.  You will likely want to set up an external script to purge expired
+sessions on a regular basis.  See the script in the source at
+``django/bin/daily_cleanup.py`` as an example.
+
 If you don't want to use sessions, you might as well remove the
 ``SessionMiddleware`` line from ``MIDDLEWARE_CLASSES`` and ``'django.contrib.sessions'``
 from your ``INSTALLED_APPS``. It'll save you a small bit of overhead.