Ticket #18125: filters_in_tags.diff

docs/topics/templates.txt

@@ -226 +226 @@
            Athlete: {{ athlete_list.0.name }}
         {% endif %}
 
+    While the above example works, be aware that template filters return 
+    strings and mathematical comparisons using filters will generally not work
+    as you expect.
+
 :ttag:`block` and :ttag:`extends`
     Set up `template inheritance`_ (see below), a powerful way
     of cutting down on "boilerplate" in templates.