Index: tempfile.rst
===================================================================
--- tempfile.rst	(revision 74738)
+++ tempfile.rst	(working copy)
@@ -131,7 +131,9 @@
 
    :func:`mkstemp` returns a tuple containing an OS-level handle to an open
    file (as would be returned by :func:`os.open`) and the absolute pathname
-   of that file, in that order.
+   of that file, in that order. Remember to call ``os.close()`` on that open
+   file when it is not needed any more or you may risk getting IOError
+   exceptions (Too many open files).
 
    .. versionadded:: 2.3