diff --git a/docs/intro.rst b/docs/intro.rst
index 187cba3..1a42ed5 100644
--- a/docs/intro.rst
+++ b/docs/intro.rst
@@ -173,6 +173,7 @@ Setting custom properties of files
 
 .. code:: python
 
+    import asyncio
     import yadisk_async
 
     async def main():