diff --git a/public/js/index.js b/public/js/index.js
index bb942122..8c4172c5 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -93,7 +93,7 @@ var cursorActivityDebounce = 50
 var cursorAnimatePeriod = 100
 var supportContainers = ['success', 'info', 'warning', 'danger']
 var supportCodeModes = ['javascript', 'typescript', 'jsx', 'htmlmixed', 'htmlembedded', 'css', 'xml', 'clike', 'clojure', 'ruby', 'python', 'shell', 'php', 'sql', 'haskell', 'coffeescript', 'yaml', 'pug', 'lua', 'cmake', 'nginx', 'perl', 'sass', 'r', 'dockerfile', 'tiddlywiki', 'mediawiki', 'go']
-var supportCharts = ['sequence', 'flow', 'graphviz', 'mermaid']
+var supportCharts = ['sequence', 'flow', 'graphviz', 'mermaid', 'abc']
 var supportHeaders = [
   {
     text: '# h1',