diff --git a/.env b/.env
index b2ab9f9..defece2 100644
--- a/.env
+++ b/.env
@@ -1,3 +1,3 @@
 NODE_ENV="development"
 JWT_SECRET=kj3h45bl2k34jt23498570q9n8098354t7029358tyowie5uthw8475tyq98347ty834irhfoqi34uyt18
-APP_DOMAIN="http://localhost:4000"
\ No newline at end of file
+APP_DOMAIN="https://be-dyrevelfaerd.herokuapp.com"
\ No newline at end of file
diff --git a/README.md b/README.md
index 1925822..a79cd19 100644
--- a/README.md
+++ b/README.md
@@ -14,3 +14,6 @@ npm start
 
 ## Documentation
 http://localhost:4000
+
+## Configuration
+Edit `.env` with the appropriate values for each variable.
diff --git a/controllers/asset.controller.js b/controllers/asset.controller.js
index 97c27e5..30ee08a 100644
--- a/controllers/asset.controller.js
+++ b/controllers/asset.controller.js
@@ -37,10 +37,14 @@ async function getSingleAsset(req, res, next) {
 async function updateSingleAsset(req, res, next) {
 	try {
 		let asset = await Asset.findByPk(req.params.id);
-		asset.update({
-			url: req.fields.url
-		});
-		res.json(asset);
+
+		if (asset) {
+			asset.url = req.fields.url;
+			asset.save();
+			res.json(asset);
+		} else {
+			res.status(404).end();
+		}
 	} catch(error) {
 		console.error(error);
 		res.status(500).end();