diff --git a/Doc/library/copy.rst b/Doc/library/copy.rst
index 121c44a16ad43b9..39fc7800d03a916 100644
--- a/Doc/library/copy.rst
+++ b/Doc/library/copy.rst
@@ -72,9 +72,13 @@ file, socket, window, or any similar types.  It does "copy" functions and
 classes (shallow and deeply), by returning the original object unchanged; this
 is compatible with the way these are treated by the :mod:`pickle` module.
 
-Shallow copies of dictionaries can be made using :meth:`dict.copy`, and
-of lists by assigning a slice of the entire list, for example,
-``copied_list = original_list[:]``.
+Shallow copies of many collections can be made using the corresponding
+:meth:`!copy` method (such as :meth:`list.copy`, :meth:`dict.copy` or
+:meth:`set.copy`), and of sequences (such as lists or bytearrays) by making
+a slice of the entire sequence (``sequence[:]``).
+However, these methods and slicing can create an instance of the base type
+when copying an instance of a subclass, whereas :func:`copy.copy` normally
+returns an instance of the same type.
 
 .. index:: pair: module; pickle
 
diff --git a/Doc/library/sched.rst b/Doc/library/sched.rst
index 70541c5f3cb3676..037e27f031d0c82 100644
--- a/Doc/library/sched.rst
+++ b/Doc/library/sched.rst
@@ -117,9 +117,11 @@ Scheduler Objects
    function passed to the constructor) for the next event, then execute it and so
    on until there are no more scheduled events.
 
-   If *blocking* is false executes the scheduled events due to expire soonest
-   (if any) and then return the deadline of the next scheduled call in the
-   scheduler (if any).
+   If *blocking* is false, immediately executes all events in the queue which have
+   a time value less than or equal to the current *timefunc* value (if any) and
+   returns the difference between the current *timefunc* value and the time value
+   of the next scheduled event in the scheduler's event queue.  If the queue is
+   empty, returns ``None``.
 
    Either *action* or *delayfunc* can raise an exception.  In either case, the
    scheduler will maintain a consistent state and propagate the exception.  If an