diff --git a/pep-0484.txt b/pep-0484.txt
index f95a10c17..b3c24d5ab 100644
--- a/pep-0484.txt
+++ b/pep-0484.txt
@@ -1558,7 +1558,7 @@ errors by creating simple classes. For example::
   class UserId(int):
       pass
 
-  get_by_user_id(user_id: UserId):
+  def get_by_user_id(user_id: UserId):
       ...
 
 However, this approach introduces a runtime overhead. To avoid this,