diff --git a/README.md b/README.md
index d15f97f..ee1a6ab 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # naive-keypad
 
-# Build the browser application
+## Build the browser application
 
 Ensure you have [Node.js](https://nodejs.org) installed. Then run:
 
@@ -8,3 +8,13 @@ Ensure you have [Node.js](https://nodejs.org) installed. Then run:
 npm install
 npm run build
 ```
+
+Copy the contents of the `dist` directory to your web server, and there you go!
+
+## Changing the code
+
+You may during the build process override the code of the keypad:
+
+```sh
+VITE_KEYPAD_CODE=7894 npm run build
+```
diff --git a/src/digicode.ts b/src/digicode.ts
index 5967ad4..960cc97 100644
--- a/src/digicode.ts
+++ b/src/digicode.ts
@@ -1,6 +1,6 @@
 import './style.css';
 
-const CODE = '1234';
+const CODE = import.meta.env.VITE_KEYPAD_CODE || '1234';
 let builder = '';
 
 const display = document.getElementById('display') as HTMLDivElement;
diff --git a/tsconfig.json b/tsconfig.json
index 75abdef..736af3f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "useDefineForClassFields": true,
     "module": "ESNext",
     "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "types": ["vite/client"],
     "skipLibCheck": true,
 
     /* Bundler mode */