diff --git a/README.md b/README.md
index 2dd1417..2ec9b04 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ var option = {
     autoplay: false,                                                   // Optional, autoplay video, not supported by mobile browsers
     theme: '#FADFA3',                                                  // Optional, theme color, default: #b7daff
     loop: true,                                                        // Optional, loop play music, default: true
-    lang: zh,                                                          // Optional, language, `zh` for Chinese, `en` for English, default: en
+    lang: 'zh',                                                        // Optional, language, `zh` for Chinese, `en` for English, default: en
     video: {                                                           // Required, video info
         url: '若能绽放光芒.mp4',                                         // Required, video url
         pic: '若能绽放光芒.png'                                          // Optional, music picture