diff --git a/.env b/.env
index ec38058..32c7f73 100644
--- a/.env
+++ b/.env
@@ -40,6 +40,7 @@ FIREBASE_VAPID_KEY=
 # Service account — from Firebase Console → Project Settings → Service accounts → Generate new private key
 FIREBASE_SERVICE_ACCOUNT=
 
+#Required for iOS notifications (create here: https://vapidkeys.com/ with valid email address)
 VAPID_SUBJECT=mailto:webpush@yourdomain.com
 VAPID_PUBLIC=
 VAPID_PRIVATE=
\ No newline at end of file