diff --git a/tests/metagpt/memory/test_memory_storage.py b/tests/metagpt/memory/test_memory_storage.py
index 881b47d6f..c9585054a 100644
--- a/tests/metagpt/memory/test_memory_storage.py
+++ b/tests/metagpt/memory/test_memory_storage.py
@@ -2,7 +2,8 @@
 # -*- coding: utf-8 -*-
 """
 @Desc   : the unittests of metagpt/memory/memory_storage.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.
 """