Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 79888)
+++ Modules/posixmodule.c	(working copy)
@@ -2432,8 +2432,8 @@
 #endif /* MS_WINDOWS */
 
 PyDoc_STRVAR(posix_mkdir__doc__,
-"mkdir(path [, mode=0777])\n\n\
-Create a directory.");
+"mkdir(path [, mode])\n\n\
+Create a directory. mode defaults to 0777 if not specified");
 
 static PyObject *
 posix_mkdir(PyObject *self, PyObject *args)