asyncio doc: close the loop at exit
diff --git a/Doc/library/asyncio-stream.rst b/Doc/library/asyncio-stream.rst
index 22733c1..b5ffdba 100644
--- a/Doc/library/asyncio-stream.rst
+++ b/Doc/library/asyncio-stream.rst
@@ -256,6 +256,7 @@
     loop = asyncio.get_event_loop()
     task = asyncio.async(print_http_headers(url))
     loop.run_until_complete(task)
+    loop.close()
 
 Usage::