diff --git a/neural_network/chatbot/chat_db.py b/neural_network/chatbot/chat_db.py
index 3dce67120..e888bc0ec 100644
--- a/neural_network/chatbot/chat_db.py
+++ b/neural_network/chatbot/chat_db.py
@@ -1,3 +1,7 @@
+"""
+credits : https://medium.com/google-developer-experts/beyond-live-sessions-building-persistent-memory-chatbots-with-langchain-gemini-pro-and-firebase-19d6f84e21d3
+"""
+
 import os
 import datetime
 import mysql.connector