diff --git a/src/extensions/index.js b/src/extensions/index.js
index 8cf9553f..6262ce20 100644
--- a/src/extensions/index.js
+++ b/src/extensions/index.js
@@ -1,4 +1,5 @@
 import './emojiExtension';
+import './abcNotationExtension';
 import './katexExtension';
 import './markdownExtension';
 import './mermaidExtension';