--- a/Doc/library/os.rst	Tue Apr 24 21:09:17 2012 +0200
+++ b/Doc/library/os.rst	Thu Apr 26 19:56:05 2012 +0200
@@ -992,6 +992,10 @@
    Parameters to the :func:`lseek` function. Their values are 0, 1, and 2,
    respectively. Availability: Windows, Unix.
 
+   .. versionadded:: 3.3
+      Some operating systems could support additional values, like
+      :data:`os.SEEK_HOLE` or :data:`os.SEEK_DATA`.
+
 
 .. function:: mkdirat(dirfd, path, mode=0o777)