Added a cross-ref to each other.
diff --git a/Doc/library/difflib.rst b/Doc/library/difflib.rst
index 95b83e6..60367a4 100644
--- a/Doc/library/difflib.rst
+++ b/Doc/library/difflib.rst
@@ -12,6 +12,10 @@
.. versionadded:: 2.1
+This module provides classes and functions for comparing sequences. It
+can be used for example, for comparing files, and can produce difference
+information in various formats, including HTML and context and unified
+diffs. For comparing directories and files, see also, the :mod:`filecmp` module.
.. class:: SequenceMatcher