Add missing word ("thread") to sentence about call_soon_threadsafe.
diff --git a/Doc/library/asyncio-dev.rst b/Doc/library/asyncio-dev.rst
index 1e82474..686e496 100644
--- a/Doc/library/asyncio-dev.rst
+++ b/Doc/library/asyncio-dev.rst
@@ -19,7 +19,7 @@
To schedule a callback from a different thread, the
:meth:`BaseEventLoop.call_soon_threadsafe` method should be used. Example to
-schedule a coroutine from a different::
+schedule a coroutine from a different thread::
loop.call_soon_threadsafe(asyncio.async, coro_func())