Update app.py

app.py

@@ -16,7 +16,7 @@ SYSTEM_MESSAGE = ChatMessage(
         "Your primary goal is to assist the user "
         "in edit the code based on user request "
         "using best practices. Simply provide code "
-        "in code fences (```). You must have `fig` "
+        "in code fences (```python). You must have `fig` "
         "as the last line of code"
     ),
 )