diff --git a/nest-asyncio/README.md b/nest-asyncio/README.md
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+```python
+''
+import asyncio
+(loop := asyncio.get_event_loop()).__class__._check_running = lambda _: None
+def _run_once(self):
+    self._process_events(self._selector.select(0))
+    if (ready := self._ready) and not (handle := ready.popleft())._cancelled:
+        task = (tasks := asyncio.tasks._current_tasks).pop(self, None)
+        handle._run()
+        tasks[self] = task
+loop.__class__._run_once = _run_once
+asyncio.run = loop.run_until_complete
+''
+async def hello():
+    async def world(): print('hello')
+    asyncio.run(world()) or print('world')
+asyncio.run(hello()) # OK
+''
+```
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