diff --git a/docs/topics/item-pipeline.rst b/docs/topics/item-pipeline.rst
index 8194fe043..9a53f88fb 100644
--- a/docs/topics/item-pipeline.rst
+++ b/docs/topics/item-pipeline.rst
@@ -190,7 +190,7 @@ item.
 
         SPLASH_URL = "http://localhost:8050/render.png?url={}"
 
-        def __init__(crawler):
+        def __init__(self, crawler):
             self.crawler = crawler
 
         @classmethod