diff --git a/advanced-iterators.html b/advanced-iterators.html
index 2476728..ae0f557 100644
--- a/advanced-iterators.html
+++ b/advanced-iterators.html
@@ -12,12 +12,14 @@ body{counter-reset:h1 6}
 <p>You are here: <a href=index.html>Home</a> <span>&#8227;</span> <a href=table-of-contents.html#advanced-iterators>Dive Into Python 3</a> <span>&#8227;</span>
 <h1>Advanced Iterators</h1>
 <blockquote class=q>
-<p><span>&#x275D;</span> Life is playfulness. We need to play so that we can rediscover the magical around us. <span>&#x275E;</span><br>&mdash; Flora Colao
+<p><span>&#x275D;</span> Great fleas have little fleas upon their backs to bite &#8217;em,<br>And little fleas have lesser fleas, and so ad infinitum. <span>&#x275E;</span><br>&mdash; Augustus De Morgan
 </blockquote>
 <p id=toc>&nbsp;
 <h2 id=divingin>Diving In</h2>
 <p class=f>FIXME
 
+<p><a href="http://code.activestate.com/recipes/576615/">original recipe by Raymond Hettinger</a>, ported to Python 3 and used as the basis for this chapter with his permission.
+
 <p class=d>[<a href=examples/alphametics.py>download <code>alphametics.py</code></a>]
 <pre><code>import re
 import itertools