diff --git a/README.md b/README.md
index 9cf0a51..87d32f8 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ cd dashboard-standalone-app
 -   Set `background.png` for Mac DMG package
 
 ```
+npm clean-all
 npm install
 npm run build
 ```