#2491: os.fdopen() is now almost an alias to the builtin open(), and accepts the same parameters.
It just checks that the first argument is a file descriptor.
diff --git a/Misc/NEWS b/Misc/NEWS
index 5f1d905..d19984a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,10 @@
 Library
 -------
 
+- Issue #2491: os.fdopen is now almost an alias for the built-in open(), and
+  accepts the same parameters.  It just checks that its first argument is an
+  integer.
+
 - Issue #3394: zipfile.writestr sets external attributes when passed a
   file name rather than a ZipInfo instance, so files are extracted with
   mode 0600 rather than 000 under Unix.