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@@ -216,6 +216,10 @@ Scheduling callbacks
A thread-safe variant of :meth:`call_soon`. Must be used to
schedule callbacks *from another thread*.
+ Raises :exc:`RuntimeError` if called on a loop that's been closed.
+ This can happen on a secondary thread when the main application is
+ shutting down.
+
See the :ref:`concurrency and multithreading <asyncio-multithreading>`
section of the documentation.