diff --git a/Working-with-Updates.md b/Working-with-Updates.md
index d7880a0..0ab8046 100644
--- a/Working-with-Updates.md
+++ b/Working-with-Updates.md
@@ -33,7 +33,7 @@ def replier(update):
         client.send_message(PeerUser(update.user_id), update.message[::-1])
 
 
-client.add_update_handler(callback)
+client.add_update_handler(replier)
 input('Press enter to stop this!')
 ```