Add the sorting HOWTO to the main docs.
diff --git a/Doc/howto/index.rst b/Doc/howto/index.rst
index 7d64688..022beee 100644
--- a/Doc/howto/index.rst
+++ b/Doc/howto/index.rst
@@ -20,6 +20,7 @@
    functional.rst
    regex.rst
    sockets.rst
+   sorting.rst
    unicode.rst
    urllib2.rst
    webservers.rst