diff --git a/metagpt/memory/memory.py b/metagpt/memory/memory.py
index 282e89b17..7f04be63d 100644
--- a/metagpt/memory/memory.py
+++ b/metagpt/memory/memory.py
@@ -5,7 +5,7 @@
 @Author  : alexanderwu
 @File    : memory.py
 @Modified By: mashenquan, 2023-11-1. According to Chapter 2.2.1 and 2.2.2 of RFC 116:
-        Modify the new message distribution feature for message filtering.
+        Updated the message filtering logic.
 """
 from collections import defaultdict
 from typing import Iterable, Set
diff --git a/metagpt/roles/engineer.py b/metagpt/roles/engineer.py
index 9826ea0b7..ff71a61d8 100644
--- a/metagpt/roles/engineer.py
+++ b/metagpt/roles/engineer.py
@@ -4,10 +4,12 @@
 @Time    : 2023/5/11 14:43
 @Author  : alexanderwu
 @File    : engineer.py
-@Modified By: mashenquan, 2023-11-1. Optimization:
-    1. Consolidate message reception and processing logic within `_observe`.
-    2. Fix bug: Add logic for handling asynchronous message processing when messages are not ready.
-    3. Supplemented the external transmission of internal messages.
+@Modified By: mashenquan, 2023-11-1. In accordance with Chapter 2.2.1 and 2.2.2 of RFC 116:
+    1. Modify the data type of the `cause_by` value in the `Message` to a string, and utilize the new message
+        distribution feature for message filtering.
+    2. Consolidate message reception and processing logic within `_observe`.
+    3. Fix bug: Add logic for handling asynchronous message processing when messages are not ready.
+    4. Supplemented the external transmission of internal messages.
 """
 import asyncio
 import shutil