diff --git a/_includes/sections/email-clients.html b/_includes/sections/email-clients.html
index 372e66ae..ef40241b 100644
--- a/_includes/sections/email-clients.html
+++ b/_includes/sections/email-clients.html
@@ -60,7 +60,8 @@
 {% include cardv2.html
   title="Letterbox"
   image="/assets/img/svg/3rd-party/letterbox.svg"
-  description="Letterbox is a free open-source mail client on iOS and part of an ongoing research project at the Freie Universität Berlin, Germany."
+  labels="color==warning::link==https://letterbox-app.org/study.html::text==Warning::tooltip==Letterbox is a research project and still under development. Use at your own risk!"
+  description="Letterbox is a free open-source mail client made as a part of an ongoing research project at the Freie Universität Berlin, Germany."
   website="https://letterbox-app.org/"
   privacy-policy="https://letterbox-app.org/privacy.html"
   forum="https://forum.privacytools.io/t/"