diff --git a/README.md b/README.md
index ef30b7b..12fe242 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 
-# whisper_streaming
+# whisper_streaming (beta version)
 
 [![CI](https://github.com/shirayu/whisper_streaming/actions/workflows/ci.yml/badge.svg)](https://github.com/shirayu/whisper_streaming/actions/workflows/ci.yml)
 [![CodeQL](https://github.com/shirayu/whisper_streaming/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/shirayu/whisper_streaming/actions/workflows/codeql-analysis.yml)