Documented QueueListener change.
diff --git a/Doc/library/logging.handlers.rst b/Doc/library/logging.handlers.rst
index eda9302..9346e99 100644
--- a/Doc/library/logging.handlers.rst
+++ b/Doc/library/logging.handlers.rst
@@ -838,6 +838,15 @@
Note that if you don't call this before your application exits, there
may be some records still left on the queue, which won't be processed.
+ .. method:: enqueue_sentinel()
+
+ Writes a sentinel to the queue to tell the listener to quit. This
+ implementation uses ``put_nowait()``. You may want to override this
+ method if you want to use timeouts or work with custom queue
+ implementations.
+
+ .. versionadded:: 3.3
+
.. seealso::