diff --git a/example/ex04_reply/ex04.py b/example/ex04_reply/ex04.py
index f24004c..b14121d 100644
--- a/example/ex04_reply/ex04.py
+++ b/example/ex04_reply/ex04.py
@@ -14,7 +14,7 @@
 # register command
 # invoke this via saying `!hello` in channel
 @bot.command(name='hello')
-async def roll(msg: Message):
+async def world(msg: Message):
     # quote reply
     await msg.reply('world for you!')
     # msg from reply_temp & send_temp will be cleaned when you restart client or refresh browser