diff --git a/app.json b/app.json
index 7bebc1473a6..fa60f6fbab7 100644
--- a/app.json
+++ b/app.json
@@ -8,7 +8,7 @@
   "env": {
     "BUILDPACK_URL": "https://github.com/RocketChat/heroku-buildpack-meteor.git",
     "ROOT_URL": {
-      "description": "IMPORTANT! Please fill with https://<App Name>.herokuapp.com. Replace <App Name> with the value you provided on the top. This will be the full URL of your Rocket.Chat app."
+      "description": "IMPORTANT! Must be 'https://<App Name>.herokuapp.com' Replace <App Name> with the value you provided at the top. This will be the full URL of your Rocket.Chat."
     }
   },
   "addons": [