fix typo error

README.md

@@ -117,6 +117,8 @@ For advanced user, we have provided train and inference scripts in `examples/lib
 You can get familiar with CosyVoice following this recipie.
 
 **Serve with FastAPI**
+The `main.py` file has added a `TTS` api with `CosyVoice-300M-SFT` model, you can update the code based on **Basic Usage** as above.
+
 ```sh
 # For development
 fastapi dev --port 3003