diff --git a/flake.nix b/flake.nix
index 60faa0b0..4cbf0e0b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -75,6 +75,7 @@
               environment.systemPackages = with pkgs; [
                 chronos
                 cosmic-ext-applet-clipboard-manager
+                cosmic-ext-applet-external-monitor-brightness
                 cosmic-ext-applet-emoji-selector
                 cosmic-ext-calculator
                 cosmic-ext-examine