diff --git a/nixos/modules/services/x11/xserver.nix b/nixos/modules/services/x11/xserver.nix
index 2f4eff1db58..3a9b70c0673 100644
--- a/nixos/modules/services/x11/xserver.nix
+++ b/nixos/modules/services/x11/xserver.nix
@@ -333,7 +333,7 @@ in
       xkbOptions = mkOption {
         type = types.commas;
         default = "terminate:ctrl_alt_bksp";
-        example = "grp:caps_toggle, grp_led:scroll";
+        example = "grp:caps_toggle,grp_led:scroll";
         description = ''
           X keyboard options; layout switching goes here.
         '';