diff --git a/README.md b/README.md
index 01f9205..99dc842 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ marked:
   dompurify: false,
   headerIds: true
   lazyload: false
-  prependRoot: false
+  prependRoot: true
   postAsset: false
   external_link:
     enable: false
diff --git a/index.js b/index.js
index 3781d18..21b27cf 100644
--- a/index.js
+++ b/index.js
@@ -18,8 +18,7 @@ hexo.config.marked = Object.assign({
   headerIds: true,
   anchorAlias: false,
   lazyload: false,
-  // TODO: enable prependRoot by default in v4
-  prependRoot: false,
+  prependRoot: true,
   postAsset: false,
   external_link: {
     enable: false,