Update index.md

Author: HomunMage

Backend/index.md

@@ -43,7 +43,7 @@ you can put anything at ext
 
 This use FastAPI server to communicate with frontend.
 
-Current implementation only runs graph.json.
+Current implementation only runs workflow.json.
 
 ## multi user support
 if you use [nginx.conf](https://github.com/LangGraph-GUI/LangGraph-GUI/blob/main/nginx/nginx.conf)