diff --git a/docs/zh/dev-guide/plugin-dev.md b/docs/zh/dev-guide/plugin-dev.md
index b7fa0cb867..da705390d8 100644
--- a/docs/zh/dev-guide/plugin-dev.md
+++ b/docs/zh/dev-guide/plugin-dev.md
@@ -288,7 +288,7 @@ module.exports.hooks = (api) => {
     const renderIndex = lines.findIndex(line => line.match(/render/))
     lines[renderIndex] += `${EOL}  router,`
 
-    fs.writeFileSync(api.entryFile, line.join(EOL), { encoding: 'utf-8' })
+    fs.writeFileSync(api.entryFile, lines.join(EOL), { encoding: 'utf-8' })
   })
 }
 ```