diff --git a/nixos/modules/programs/firejail.nix b/nixos/modules/programs/firejail.nix
index 74c3e4425a7c..0abdde5ddebd 100644
--- a/nixos/modules/programs/firejail.nix
+++ b/nixos/modules/programs/firejail.nix
@@ -25,8 +25,14 @@ in {
     enable = mkEnableOption "firejail";
 
     wrappedBinaries = mkOption {
-      type = types.attrs;
+      type = types.attrsOf types.path;
       default = {};
+      example = literalExample ''
+        {
+          firefox = "''${lib.getBin pkgs.firefox}/bin/firefox";
+          mpv = "''${lib.getBin pkgs.mpv}/bin/mpv";
+        }
+      '';
       description = ''
         Wrap the binaries in firejail and place them in the global path.
         </para>