Document ineffectiveness of specifying `Page._meta.ordering`

docs/topics/creating_pages.rst

@@ -77,3 +77,24 @@ Make your model names more friendly to users of Wagtail using Django's internal
             verbose_name = "Homepage"
 
 When users are given a choice of pages to create, the list of page types is generated by splitting your model names on each of their capital letters. Thus a ``HomePage`` model would be named "Home Page" which is a little clumsy. ``verbose_name`` as in the example above, would change this to read "Homepage" which is slightly more conventional.
+
+
+Page QuerySet ordering
+----------------------
+
+``Page``-derived models *cannot* be given a default ordering by using the standard Django approach of adding an ``ordering`` attribute to the internal ``Meta`` class.
+
+.. code-block:: python
+
+    class NewsItemPage(Page):
+        publication_date = models.DateField()
+        ...
+
+        class Meta:
+            ordering = ('-publication_date', )  # will not work
+
+This is because ``Page`` enforces ordering QuerySets by path. Instead you must apply the ordering explicitly when you construct a QuerySet:
+
+.. code-block:: python
+
+    news_items = NewsItemPage.objects.live().order_by('-publication_date')