diff --git a/app.json b/app.json
index 9a955acb..e7f866ad 100644
--- a/app.json
+++ b/app.json
@@ -17,11 +17,11 @@
     "env": {
         "ENV": {
             "value": "heroku",
-            "description": "Do not modify this value as it's required to work on Heroku."
+            "description": "Warning: Do not modify this value on Heroku deployments."
         },
         "BUILDPACK_URL": {
             "value": "https://github.com/heroku/heroku-buildpack-php",
-            "description": "Do not modify this value as it's required to work on Heroku."
+            "description": "Warning: Do not modify this value on Heroku deployments."
         }
     },
     "scripts": {