diff --git a/nixos/modules/services/misc/pykms.nix b/nixos/modules/services/misc/pykms.nix
index 059fb9e660926..a8f08e5ab1862 100644
--- a/nixos/modules/services/misc/pykms.nix
+++ b/nixos/modules/services/misc/pykms.nix
@@ -29,6 +29,7 @@ in
       listenAddress = lib.mkOption {
         type = lib.types.str;
         default = "0.0.0.0";
+        example = "::";
         description = "The IP address on which to listen.";
       };