Fix markup
diff --git a/Doc/library/sched.rst b/Doc/library/sched.rst
index f9e81f0..95ec499 100644
--- a/Doc/library/sched.rst
+++ b/Doc/library/sched.rst
@@ -129,3 +129,5 @@
    Read-only attribute returning a list of upcoming events in the order they
    will be run.  Each event is shown as a :term:`named tuple` with the
    following fields:  time, priority, action, argument.
+
+   .. versionadded:: 2.6