Index: django/trunk/docs/sites.txt
===================================================================
--- django/trunk/docs/sites.txt	(revision 5823)
+++ django/trunk/docs/sites.txt	(working copy)
@@ -213,6 +213,31 @@
     >>> 'http://%s%s' % (Site.objects.get_current().domain, obj.get_absolute_url())
     'http://example.com/mymodel/objects/3/'
 
+Caching the current ``Site`` object
+===================================
+
+**New in Django development version**
+
+As the current site is stored in the database, each call to
+``Site.objects.get_current()`` could result in a database query. But Django is a
+little cleverer than that: on the first request, the current site is cached, and
+any subsequent call returns the cached data instead of hitting the database.
+
+If for any reason you want to force a database query, you can tell Django to
+clear the cache using ``Site.objects.clear_cache()``::
+
+    # First call; current site fetched from database.
+    current_site = Site.objects.get_current()
+    # ...
+
+    # Second call; current site fetched from cache.
+    current_site = Site.objects.get_current()
+    # ...
+
+    # Force a database query for the third call.
+    Site.objects.clear_cache()
+    current_site = Site.objects.get_current()
+
 The ``CurrentSiteManager``
 ==========================