diff --git a/app.json b/app.json
index 10e621d3..11ecc89a 100644
--- a/app.json
+++ b/app.json
@@ -15,8 +15,9 @@
         "heroku-postgresql"
     ],
     "env": {
-        "ENV": { "value": "heroku", "description": "Do not modify this value to work on Heroku" },
-        "BUILDPACK_URL": { "value": "https://github.com/cachethq/cachet-buildpack", "description": "Do not modify this value to work on Heroku" }
+        "ENV": { "value": "heroku", "description": "Do not modify this value as it's required to work on Heroku." },
+        "BUILDPACK_URL": { "value": "https://github.com/cachethq/cachet-buildpack", "description": "Do not modify this value as it's required to work on Heroku." },
+        "APP_DEBUG": { "value": false, "description": "Toggle Cachet debugging." }
     },
     "scripts": {
         "postdeploy": "php artisan migrate --env=heroku; php artisan key:generate;"