diff --git a/2019/12/webpack.md b/2019/12/webpack.md
index 6c94490..4fc6f66 100644
--- a/2019/12/webpack.md
+++ b/2019/12/webpack.md
@@ -92,4 +92,8 @@ module.exports = {
 
 ### webpack热更新
 
-1.安装 
\ No newline at end of file
+1.安装 webpack-dev-server 
+
+yarn global add webpack-dev-server
+
+2.