diff --git a/README.md b/README.md
index 8ba7cad..ff9f5c1 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,9 @@ License: [Apache-2.0 License](https://github.com/PyThaiNLP/pythaitts/blob/main/L
 
 Install by pip:
 
-> pip install pythaitts
+```sh
+pip install pythaitts
+```
 
 ## Usage
 
diff --git a/requirements.txt b/requirements.txt
index 6501dea..1305612 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 huggingface_hub
 numpy>=1.22
 onnxruntime
-vachanatts
\ No newline at end of file
+vachanatts
+soundfile
\ No newline at end of file