diff --git a/Doc/library/sched.rst b/Doc/library/sched.rst
index 4d4a6161057cc5c..89e4ef15ff8c2d5 100644
--- a/Doc/library/sched.rst
+++ b/Doc/library/sched.rst
@@ -69,7 +69,8 @@ Scheduler Objects
    Schedule a new event. The *time* argument should be a numeric type compatible
    with the return value of the *timefunc* function passed  to the constructor.
    Events scheduled for the same *time* will be executed in the order of their
-   *priority*.
+   *priority*. Lower priority numbers mean higher priority; in this
+   way the queue can be maintained as a priority queue.
 
    Executing the event means executing ``action(*argument, **kwargs)``.
    *argument* is a sequence holding the positional arguments for *action*.