Add reference to enumerate() to indices example.
diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
index 809afc1..f57e9e9 100644
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -104,8 +104,8 @@
>>> range(-10, -100, -30)
[-10, -40, -70]
-To iterate over the indices of a sequence, combine :func:`range` and :func:`len`
-as follows::
+To iterate over the indices of a sequence, you can combine :func:`range` and
+:func:`len` as follows::
>>> a = ['Mary', 'had', 'a', 'little', 'lamb']
>>> for i in range(len(a)):
@@ -117,6 +117,9 @@
3 little
4 lamb
+In most such cases, however, it is convenient to use the :func:`enumerate`
+function, see :ref:`tut-loopidioms`.
+
.. _tut-break: