diff --git a/.env.sample b/.env.sample
index 1495108..a38b355 100644
--- a/.env.sample
+++ b/.env.sample
@@ -1,7 +1,8 @@
+# Copy and rename to .env to use environment variables
 # dev environment vars
-
+PORT=3000 
 
 # staging environment vars
 
 
-# local environment vars
\ No newline at end of file
+# local environment vars
diff --git a/src/main.ts b/src/main.ts
index ad098db..3d5c77d 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -10,6 +10,6 @@ async function bootstrap() {
   // TODO: set env variable here
     origin: 'http://localhost:3001', // the frontend (next.js) server
   }*/);
-  await app.listen(3000);
+  await app.listen(process.env.PORT);
 }
 bootstrap();