diff --git a/example/flask_op/README.md b/example/flask_op/README.md
index 721bdcb..5527067 100644
--- a/example/flask_op/README.md
+++ b/example/flask_op/README.md
@@ -4,5 +4,5 @@ To run the Flask based example application, execute the following commands:
 ```bash
 cd flask_op/
 pip install -r requirements.txt # install the dependencies
-./server.py config.yaml
-```
\ No newline at end of file
+./server.py config.json
+```