diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 848fd167cbb..fc909f20559 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -757,8 +757,6 @@ as internal buffering of data.
 
    As of Python 3.3, this is equivalent to ``os.pathconf(fd, name)``.
 
-   Availability: Unix.
-
 
 .. function:: fstat(fd)