diff --git a/build/md-loader/containers.js b/build/md-loader/containers.js
index bcdce5be8..4be9010e7 100644
--- a/build/md-loader/containers.js
+++ b/build/md-loader/containers.js
@@ -11,7 +11,7 @@ module.exports = md => {
         const description = m && m.length > 1 ? m[1] : '';
         const content = tokens[idx + 1].type === 'fence' ? tokens[idx + 1].content : '';
         return `<demo-block>
-        <div>${md.render(description)}</div>
+        ${description ? `<div>${md.render(description)}</div>` : ''}
         <!--element-demo: ${content}:element-demo-->
         `;
       }