added note about dictionary comprehensions

advanced-iterators.html

@@ -407,7 +407,7 @@ Wesley</samp></pre>
  'N': '5', 'S': '1', 'R': '6', 'Y': '7'}</samp></pre>
 <ol>
 <li>Given a list of letters and a list of digits (each represented here as 1-character strings), the <code>zip</code> function will create a pairing of letters and digits, in order.
-<li>Why is that cool? Because that data structure happens to be exactly the right structure to pass to the <code>dict()</code> function to create a dictionary that uses letters as keys and their associated digits as values. Although the printed representation of the dictionary lists the pairs in a different order (dictionaries have no &#8220;order&#8221; per se), you can see that each letter is associated with the digit, based on the ordering of the original <var>characters</var> and <var>guess</var> sequences.
+<li>Why is that cool? Because that data structure happens to be exactly the right structure to pass to the <code>dict()</code> function to create a dictionary that uses letters as keys and their associated digits as values. (This isn&#8217;t the only way to do it, of course. You could use a dictionary comprehension [FIXME xref] to create the dictionary directly.) Although the printed representation of the dictionary lists the pairs in a different order (dictionaries have no &#8220;order&#8221; per se), you can see that each letter is associated with the digit, based on the ordering of the original <var>characters</var> and <var>guess</var> sequences.
 </ol>
 
 <p id=guess>The alphametics solver uses this technique to create a dictionary that maps letters in the puzzle to digits in the solution, for each possible solution.