diff --git a/packages/docs/docs/guide/markdown.md b/packages/docs/docs/guide/markdown.md
index 49dd1ab05b..77e457a461 100644
--- a/packages/docs/docs/guide/markdown.md
+++ b/packages/docs/docs/guide/markdown.md
@@ -274,7 +274,7 @@ module.exports = {
     anchor: { permalink: false },
     // options for markdown-it-toc
     toc: { includeLevel: [1, 2] },
-    config: md => {
+    extendMarkdown: md => {
       // use more markdown-it plugins!
       md.use(require('markdown-it-xxx'))
     }