diff --git a/mkdocs/docs/settings.md b/mkdocs/docs/settings.md
index 104bf50..0740390 100644
--- a/mkdocs/docs/settings.md
+++ b/mkdocs/docs/settings.md
@@ -40,7 +40,7 @@ Additional settings passed to yt-dlp.
 
 ## Subtitles
 
-- **Download Setting**: Select the subtitle language you like to download. Add a comma separated list for multiple languages.
+- **Download Setting**: Select the subtitle language you like to download. Add a comma separated list for multiple languages. For Chinese you must specify `zh-Hans` or `zh-Hant`, specifying "zh" is invalid, otherwise the subtitle won't download successfully.
 - **Source Settings**: User created subtitles are provided from the uploader and are usually the video script. Auto generated is from YouTube, quality varies, particularly for auto translated tracks.
 - **Index Settings**: Enabling subtitle indexing will add the lines to Elasticsearch and will make subtitles searchable. This will increase the index size and is not recommended on low-end hardware.