diff --git a/packages/ui-default/components/editor/index.tsx b/packages/ui-default/components/editor/index.tsx
index c1d6e0158..dfd5915b7 100644
--- a/packages/ui-default/components/editor/index.tsx
+++ b/packages/ui-default/components/editor/index.tsx
@@ -181,8 +181,8 @@ export default class Editor extends DOMAttachedObject {
           // '-',
           // 'strikeThrough',
           // 'title',
-          // 'sub',
-          // 'sup',
+          'sub',
+          'sup',
           // 'quote',
           // 'unorderedList',
           // 'orderedList',
diff --git a/packages/ui-default/components/editor/mdeditor.ts b/packages/ui-default/components/editor/mdeditor.ts
index 62e6ef4ac..88f934d7d 100644
--- a/packages/ui-default/components/editor/mdeditor.ts
+++ b/packages/ui-default/components/editor/mdeditor.ts
@@ -34,6 +34,10 @@ config({
       });
     }
   },
+  markdownItPlugins(plugins) {
+    console.log('Active builtin mdit plugins', plugins);
+    return plugins.filter((plugin) => ['sub', 'sup'].includes(plugin.type));
+  },
 });
 
 export { MdEditor };