diff --git a/index.js b/index.js
index b605a63..87a9115 100644
--- a/index.js
+++ b/index.js
@@ -33,7 +33,7 @@ function plugin(opt = {}) {
         children: [
           {
             type: 'text',
-            value: (title || type).trim().toUpperCase(),
+            value: (title || type).trim(),
           },
         ],
         data: { hProperties: { className: [`${className}-title`] } },