diff --git a/nixos/modules/services/x11/xserver.nix b/nixos/modules/services/x11/xserver.nix
index 2e2d567a060..262115b39e7 100644
--- a/nixos/modules/services/x11/xserver.nix
+++ b/nixos/modules/services/x11/xserver.nix
@@ -258,7 +258,7 @@ in
         type = types.str;
         default = "us";
         description = ''
-          Keyboard layout.
+          Keyboard layout, or multiple keyboard layouts separated by commas.
         '';
       };