diff --git a/website/docs/Use-Cases/agent_chat.md b/website/docs/Use-Cases/agent_chat.md
index cfe0fb529..bc98a6152 100644
--- a/website/docs/Use-Cases/agent_chat.md
+++ b/website/docs/Use-Cases/agent_chat.md
@@ -173,7 +173,7 @@ def currency_calculator(
 
 autogen.agentchat.register_function(
     currency_calculator,
-    agent=chatbot,
+    caller=chatbot,
     executor=user_proxy,
     description="Currency exchange calculator.",
 )