#6591: add reference to ioctl in fcntl module for platforms other than Windows.
diff --git a/Doc/library/socket.rst b/Doc/library/socket.rst
index b59b609..e50849d 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -599,6 +599,9 @@
The :meth:`ioctl` method is a limited interface to the WSAIoctl system
interface. Please refer to the MSDN documentation for more information.
+ On other platforms, the generic :func:`fcntl.fcntl` and :func:`fcntl.ioctl`
+ functions may be used; they accept a socket object as their first argument.
+
.. versionadded:: 2.6