Replace mentions of IOError
diff --git a/Doc/library/zipimport.rst b/Doc/library/zipimport.rst
index 4f17092..b47c35b 100644
--- a/Doc/library/zipimport.rst
+++ b/Doc/library/zipimport.rst
@@ -85,9 +85,12 @@
 
    .. method:: get_data(pathname)
 
-      Return the data associated with *pathname*. Raise :exc:`IOError` if the
+      Return the data associated with *pathname*. Raise :exc:`OSError` if the
       file wasn't found.
 
+      .. versionchanged:: 3.3
+         :exc:`IOError` used to be raised instead of :exc:`OSError`.
+
 
    .. method:: get_filename(fullname)