Index: Modules/_io/_iomodule.c
===================================================================
--- Modules/_io/_iomodule.c	(revision 76627)
+++ Modules/_io/_iomodule.c	(working copy)
@@ -176,6 +176,9 @@
  * The main open() function
  */
 PyDoc_STRVAR(open_doc,
+"open(file, mode='r', buffering=None, encoding=None,\n"
+"           errors=None, newline=None, closefd=True) -> file object\n"
+"\n"
 "Open file and return a stream.  Raise IOError upon failure.\n"
 "\n"
 "file is either a text or byte string giving the name (and the path\n"