diff --git a/docs/source/design.rst b/docs/source/design.rst
index bac34da9..dff78d30 100644
--- a/docs/source/design.rst
+++ b/docs/source/design.rst
@@ -60,7 +60,7 @@ connection job. On keepalive connections are put back in the loop
 waiting for an event. If no event happen after the keep alive timeout,
 the connection is closed.
 
-The worker `gaiohttp` is a full asyncio worker using aiohttp_
+The worker `gaiohttp` is a full asyncio worker using aiohttp_.
 
 Choosing a Worker Type
 ======================