Clarify presence of a two-element tuple.

Alois Mahdal · Alois Mahdal · commit 239909dc4c2f · 2013-09-24T14:02:54.000+02:00
diff --git a/docs/writing/style.rst b/docs/writing/style.rst
@@ -273,7 +273,8 @@ Unpacking
 ~~~~~~~~~
 
 If you know the length of a list or tuple, you can assign names to its
-elements with unpacking:
+elements with unpacking. For example, since you know that ``enumerate()``
+will provide a tuple of two elements for each item in list:
 
 .. code-block:: python
 
