Added respect_handler_level to QueueListener.
diff --git a/Doc/howto/logging-cookbook.rst b/Doc/howto/logging-cookbook.rst
index 57e23f9..e31b6c2 100644
--- a/Doc/howto/logging-cookbook.rst
+++ b/Doc/howto/logging-cookbook.rst
@@ -325,6 +325,15 @@
MainThread: Look out!
+.. versionchanged:: 3.5
+ Prior to Python 3.5, the :class:`QueueListener` always passed every message
+ received from the queue to every handler it was initialized with. (This was
+ because it was assumed that level filtering was all done on the other side,
+ where the queue is filled.) From 3.5 onwards, this behaviour can be changed
+ by passing a keyword argument ``respect_handler_level=True`` to the
+ listener's constructor. When this is done, the listener compares the level
+ of each message with the handler's level, and only passes a message to a
+ handler if it's appropriate to do so.
.. _network-logging: