diff --git a/metagpt/roles/seacher.py b/metagpt/roles/seacher.py
index 95be89277..d0b841f39 100644
--- a/metagpt/roles/seacher.py
+++ b/metagpt/roles/seacher.py
@@ -4,7 +4,8 @@
 @Time    : 2023/5/23 17:25
 @Author  : alexanderwu
 @File    : seacher.py
-@Modified By: mashenquan, 2023-11-1. Standardize the usage of message filtering-related features.
+@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.
 """
 from metagpt.actions import ActionOutput, SearchAndSummarize
 from metagpt.logs import logger
diff --git a/metagpt/roles/sk_agent.py b/metagpt/roles/sk_agent.py
index abebb9605..5b8d333bd 100644
--- a/metagpt/roles/sk_agent.py
+++ b/metagpt/roles/sk_agent.py
@@ -4,7 +4,9 @@
 @Time    : 2023/9/13 12:23
 @Author  : femto Zheng
 @File    : sk_agent.py
-@Modified By: mashenquan, 2023-11-1. Standardize the usage of message filtering-related features.
+@Modified By: mashenquan, 2023-11-1. In accordance with Chapter 2.2.1 and 2.2.2 of RFC 116, 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.
 """
 from semantic_kernel.planning import SequentialPlanner
 from semantic_kernel.planning.action_planner.action_planner import ActionPlanner