diff --git a/app.json b/app.json
index c0579d33e..c5016f695 100644
--- a/app.json
+++ b/app.json
@@ -71,6 +71,10 @@
     "SMTP_DOMAIN": {
       "description": "Domain for SMTP server. Will default to instance domain if blank.",
       "required": false
+    },
+    "SMTP_FROM_ADDRESS": {
+      "description": "Address to send emails from",
+      "required": false
     }
   },
   "buildpacks": [
@@ -88,4 +92,4 @@
     "heroku-postgresql",
     "heroku-redis"
   ]
-}
\ No newline at end of file
+}