diff --git a/examples/build_customized_agent.py b/examples/build_customized_agent.py
index af15c90ca..f7f554e53 100644
--- a/examples/build_customized_agent.py
+++ b/examples/build_customized_agent.py
@@ -2,8 +2,6 @@
 Filename: MetaGPT/examples/build_customized_agent.py
 Created Date: Tuesday, September 19th 2023, 6:52:25 pm
 Author: garylin2099
-@Modified By: mashenquan, 2023-11-1. According to Chapter 2.2.1 and 2.2.2 of RFC 116, change the data type of
-        the `cause_by` value in the `Message` to a string to support the new message distribution feature.
 """
 import asyncio
 import re
@@ -83,7 +81,7 @@ class SimpleCoder(Role):
         instruction = msg.content
 
         code_text = await SimpleWriteCode().run(instruction)
-        msg = Message(content=code_text, role=self.profile, cause_by=get_object_name(todo))
+        msg = Message(content=code_text, role=self.profile, cause_by=todo)
 
         return msg
 
diff --git a/metagpt/schema.py b/metagpt/schema.py
index 1082c5ddb..0be067cfe 100644
--- a/metagpt/schema.py
+++ b/metagpt/schema.py
@@ -135,7 +135,7 @@ class Message(BaseModel):
                 self.set_cause_by(v)
                 continue
             if k == MESSAGE_ROUTE_TO:
-                self.add_to(v)
+                self.add_to(any_to_str(v))
                 continue
             self.meta_info[k] = v