diff --git a/addons/xterm-addon-unicode-graphemes/README.md b/addons/xterm-addon-unicode-graphemes/README.md
index 6c23e343..d5922a6f 100644
--- a/addons/xterm-addon-unicode-graphemes/README.md
+++ b/addons/xterm-addon-unicode-graphemes/README.md
@@ -1,5 +1,7 @@
 ## xterm-addon-unicode-graphemes
 
+⚠️ **This addon is currently experimental and may introduce unexpected and non-standard behavior**
+
 An addon providing enhanced Unicode support (include grapheme clustering) for xterm.js.
 
 The file `src/UnicodeProperties.ts` is generated and depends on the Unicode version. See [the unicode-properties project](https://github.com/PerBothner/unicode-properties) for credits and re-generation instructions.