diff --git a/en/firmwareupdate.md b/en/firmwareupdate.md
index d69373c9637b2607b825a4902074e18e946869aa..a252e9b3f72bdc327e7dcc822baeb05e08ff8330 100644
--- a/en/firmwareupdate.md
+++ b/en/firmwareupdate.md
@@ -21,6 +21,7 @@ These releases are untested and must be considered faulty. Always create a backu
 card10 before applying them. Please follow the steps mentioned above.
 
 - [Exposure Notifications](/en/exposure_notifications): https://card10.badge.events.ccc.de/release/card10-exno-r1.zip
+  - Important: New Bluetooth bondings can only be made with the "Bluetooth" app active.
 
 ---