Ticket #21908: patch.diff

docs/ref/contrib/admin/index.txt

@@ -1393 +1393 @@
     ``obj`` being edited (or ``None`` on an add form) and is expected to return
     a ``list`` or ``tuple`` of :class:`~django.contrib.admin.InlineModelAdmin`
     objects, as described below in the :class:`~django.contrib.admin.InlineModelAdmin`
-    section.
+    section. Inline classes should be instantiated like so:
+
+        return [inline(self.model, self.admin_site) for inline in self.inlines]
 
 .. method:: ModelAdmin.get_urls()