Fix the Mako-like environment.
diff --git a/docs/switching.rst b/docs/switching.rst
index ba3cfb1..6d9abb1 100644
--- a/docs/switching.rst
+++ b/docs/switching.rst
@@ -213,7 +213,7 @@
 
 .. sourcecode:: python
 
-    env = Environment('<%', '%>', '${', '}', '%')
+    env = Environment('<%', '%>', '${', '}', '<%doc>', '</%doc>', '%', '##')
 
 Once the environment is configure like that Jinja2 should be able to interpret
 a small subset of Mako templates.  Jinja2 does not support embedded Python code