diff --git a/README.md b/README.md
index 4a00ee8925..2a9e2b67a5 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 
 ## Try it out!
 
-Try out Firefly III on the [demo site](https://firefly-iii.nder.be/).
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/firefly-iii/firefly-iii/tree/master)
 
 ## Installation
 
diff --git a/app.json b/app.json
index 5b12a07cfd..35680aa38b 100644
--- a/app.json
+++ b/app.json
@@ -52,7 +52,7 @@
   ],
   "env": {
     "APP_KEY": {
-      "description": "A secret key for verifying the integrity of signed cookies.",
+      "description": "This key is used to encrypt your data.",
       "value": "base64:If1gJN4pyycXTq+WS5TjneDympKuu+8SKvTl6RZnhJg="
     }
   }