Update app.py

app.py

@@ -77,6 +77,9 @@ def process_text_file(file: AskFileResponse):
 
 @cl.on_chat_start
 async def on_chat_start():
+
+    await cl.Message(content="Hello! This is a simply but powerful RAG app. It will build context on the fly & use LCEL chain to help with your questions. Special Bonus: this app will cache seen docs so it will expand knowledge base with every use!!").send()
+    
     files = None
 
     # Wait for the user to upload a file