diff -r e17e3f620709 -r 41b8b8444d77 Doc/library/os.rst
--- a/Doc/library/os.rst	Sat Aug 06 03:00:30 2016 +0300
+++ b/Doc/library/os.rst	Sat Aug 06 14:35:57 2016 +0200
@@ -958,7 +958,7 @@
           O_EXLOCK
           O_CLOEXEC
 
-   These constants are only available on Unix.
+   These constants are commonly only available on Unix.
 
    .. versionchanged:: 3.3
       Add :data:`O_CLOEXEC` constant.