Add FAQ entry re: arbitrary metadata in templates

docs/faq.rst

@@ -65,6 +65,20 @@ In case you don't have pip installed, consider installing it via::
 
     $ (sudo) easy_install pip
 
+Can I use arbitrary meta-data in my templates?
+==============================================
+
+Yes. For example, to include a modified date in a Markdown post, one could
+include the following at the top of the article:
+
+    Modified: 2012-08-08
+
+That meta-data can then be accessed in the template:
+
+    {% if article.modified %}
+    Last modified: {{ article.full }}
+    {% endif %}
+
 How do I assign custom templates on a per-page basis?
 =====================================================