Add :filename: also for literalinclude. Changelog entry.

doc/markup/code.rst

@@ -188,6 +188,25 @@ Includes
       The ``prepend`` and ``append`` options, as well as ``tab-width``.
 
 
+Showing a file name
+^^^^^^^^^^^^^^^^^^^
+
+.. versionadded:: 1.3
+
+A ``filename`` option can be given to show that name before the code block.  For
+example::
+
+   .. code-block:: python
+      :filename: this.py
+
+      print 'Explicit is better than implicit.'
+
+
+:rst:dir:`literalinclude` also supports the ``filename`` option, with the
+additional feature that if you leave the value empty, the shown filename will be
+exactly the one given as an argument.
+
+
 .. rubric:: Footnotes
 
 .. [1] There is a standard ``.. include`` directive, but it raises errors if the