Expand itertools paragraph
diff --git a/Doc/whatsnew/whatsnew23.tex b/Doc/whatsnew/whatsnew23.tex
index b6b5c58..7c96342 100644
--- a/Doc/whatsnew/whatsnew23.tex
+++ b/Doc/whatsnew/whatsnew23.tex
@@ -1354,9 +1354,15 @@
\item The \module{imaplib} module now supports IMAP over SSL.
(Contributed by Piers Lauder and Tino Lange.)
-\item The \ulink{\module{itertools}}{../lib/module-itertools.html}
-module provides several functions to support efficient looping using
-iterators.
+\item The \module{itertools} contains a number of useful functions for
+use with iterators, inspired by various functions provided by the ML
+and Haskell languages. For example,
+\code{itertools.ifilter(predicate, iterator)} returns all elements in
+the iterator for which the function \function{predicate()} returns
+\constant{True}, and \code{itertools.times(\var{N}, obj)} returns
+\code{obj} \var{N} times. There are a number of other functions in
+the module; see the \ulink{package's reference
+documentation}{../lib/module-itertools.html} for details.
\item Two new functions in the \module{math} module,
\function{degrees(\var{rads})} and \function{radians(\var{degs})},