diff --git a/Doc/library/asyncio-dev.rst b/Doc/library/asyncio-dev.rst
index 5f926fc..b728803 100644
--- a/Doc/library/asyncio-dev.rst
+++ b/Doc/library/asyncio-dev.rst
@@ -50,7 +50,7 @@
   <asyncio-coroutine-not-scheduled>` and logs them; this mitigates
   the "forgotten await" pitfall.
 
-* Many non-treadsafe asyncio APIs (such as :meth:`loop.call_soon` and
+* Many non-threadsafe asyncio APIs (such as :meth:`loop.call_soon` and
   :meth:`loop.call_at` methods) raise an exception if they are called
   from a wrong thread.