--- a/markdown_it.js	Sun Sep 06 22:12:52 2020 +0300
+++ b/markdown_it.js	Sun Sep 06 22:29:08 2020 +0300
@@ -65,7 +65,8 @@
         var mk = require('@neilsustc/markdown-it-katex');
         var mm = require('markdown-it-mark');
         var mr = require('markdown-it-replace-link');
-        md.use(mk, katexOptions).use(mm).use(mr);
+        var mc = require('markdown-it-checkbox');
+        md.use(mk, katexOptions).use(mm).use(mr).use(mc);
         output = md.render(input);
     } catch(e) {
         console.error(e.stack || e.message || String(e));