diff --git a/README.md b/README.md
index 9d86ba6..55aff8a 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ To customise these variables, place replacement values in `.dev.vars` (for devel
 ## Development
 
 ```sh
+npm install
 npm run dev
 ```