diff --git a/packages/@vuepress/core/lib/node/Page.js b/packages/@vuepress/core/lib/node/Page.js
index 0ea0242d84..770f351e40 100644
--- a/packages/@vuepress/core/lib/node/Page.js
+++ b/packages/@vuepress/core/lib/node/Page.js
@@ -114,7 +114,7 @@ module.exports = class Page {
         // headers
         const headers = extractHeaders(
           this._strippedContent,
-          ['h2', 'h3'],
+          ['h2', 'h3', 'h4', 'h5', 'h6'],
           markdown
         )
         if (headers.length) {