Fix some mentions of IOError
diff --git a/Doc/library/chunk.rst b/Doc/library/chunk.rst
index d3558a4..c1ba497 100644
--- a/Doc/library/chunk.rst
+++ b/Doc/library/chunk.rst
@@ -84,8 +84,9 @@
Close and skip to the end of the chunk. This does not close the
underlying file.
- The remaining methods will raise :exc:`IOError` if called after the
- :meth:`close` method has been called.
+ The remaining methods will raise :exc:`OSError` if called after the
+ :meth:`close` method has been called. Before Python 3.3, they used to
+ raise :exc:`IOError`, now an alias of :exc:`OSError`.
.. method:: isatty()