diff --git a/pkgs/by-name/si/signal-desktop/package.nix b/pkgs/by-name/si/signal-desktop/package.nix
index 6ab2d19e689c..15d59b77e2ef 100644
--- a/pkgs/by-name/si/signal-desktop/package.nix
+++ b/pkgs/by-name/si/signal-desktop/package.nix
@@ -23,6 +23,9 @@
 
   withAppleEmojis ? false,
 }:
+assert lib.warnIf (commandLineArgs != "")
+  "`commandLineArgs` has been deprecated and will be removed in the future. Consider creating a wrapper script or a desktop entry with your desired flags."
+  true;
 let
   nodejs = nodejs_24;
   pnpm = pnpm_10_29_2;