diff -r 3430d7329a3b Doc/tutorial/datastructures.rst
--- a/Doc/tutorial/datastructures.rst	Thu May 17 17:37:02 2012 +0200
+++ b/Doc/tutorial/datastructures.rst	Thu May 17 11:45:39 2012 -0500
@@ -366,6 +366,12 @@
 effect with slicing and concatenation, though).  It is also possible to create
 tuples which contain mutable objects, such as lists.
 
+Though tuples may seem very similar to lists, their immutability makes them
+ideal for fundamentally different usage.  In typical usage, tuples are a
+heterogenous structure, whereas lists are a homogenous sequence.  This tends to
+mean that, in general, tuples are used as a cohesive unit while lists are used
+one member at a time.
+
 A special problem is the construction of tuples containing 0 or 1 items: the
 syntax has some extra quirks to accommodate these.  Empty tuples are constructed
 by an empty pair of parentheses; a tuple with one item is constructed by
@@ -393,7 +399,6 @@
 sequence.  Note that multiple assignment is really just a combination of tuple
 packing and sequence unpacking.
 
-.. XXX Add a bit on the difference between tuples and lists.
 
 
 .. _tut-sets: