diff --git a/docs/zh/guide/extract-css.md b/docs/zh/guide/extract-css.md
index 3544f7fa8..5b1313d80 100644
--- a/docs/zh/guide/extract-css.md
+++ b/docs/zh/guide/extract-css.md
@@ -33,7 +33,7 @@ module.exports = {
   plugins: [
     // ... 忽略 vue-loader 插件
     new MiniCssExtractPlugin({
-      filename: style.css
+      filename: 'style.css'
     })
   ]
 }