doc: advice for reusable session

README.md

@@ -191,7 +191,7 @@ bard.get_answer("나와 내 동년배들이 좋아하는 뉴진스에 대해서
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 ### Reusable session object
-You can continue the conversation using a reusable session.
+You can continue the conversation using a reusable session. However, this feature is limited, and it is difficult for a package-level feature to perfectly maintain conversation_id and context. You can try to maintain the consistency of conversations by using other LLM services, such as passing some sort of summary of past conversations to the DB.
 ```python
 from bardapi import Bard
 import requests