diff --git a/boilerplate/elm/README.md b/boilerplate/elm/README.md
index 425d5163e..04804ad94 100644
--- a/boilerplate/elm/README.md
+++ b/boilerplate/elm/README.md
@@ -11,6 +11,7 @@ in which you can develop:
 
 ```shell
 $ nix-shell
+$ npx tailwindcss build index.css -o output.css
 $ elm-live -- src/Main.elm --output=Main.min.js
 ```