diff --git a/demos/TTSCppFrontend/README.md b/demos/TTSCppFrontend/README.md
index 592140ae1..552858de3 100644
--- a/demos/TTSCppFrontend/README.md
+++ b/demos/TTSCppFrontend/README.md
@@ -38,6 +38,7 @@ If the download speed is too slow, you can open [third-party/CMakeLists.txt](thi
 ```
 
 ## Run
+You can change `--phone2id_path` in `./front_demo/front.conf` to the `phone_id_map.txt` of your own acoustic model.
 
 ```
 ./run_front_demo.sh