diff --git a/modules/services/window-managers/i3-sway/sway.nix b/modules/services/window-managers/i3-sway/sway.nix
index f0dac2df..0445e46e 100644
--- a/modules/services/window-managers/i3-sway/sway.nix
+++ b/modules/services/window-managers/i3-sway/sway.nix
@@ -160,7 +160,7 @@ let
       output = mkOption {
         type = types.attrsOf (types.attrsOf types.str);
         default = { };
-        example = { "HDMI-A-2" = { bg = "~/path/to/background.png"; }; };
+        example = { "HDMI-A-2" = { bg = "~/path/to/background.png fill"; }; };
         description = ''
           An attribute set that defines output modules. See man sway_output for options.
         '';