diff --git a/machines/orbi/service-nix-cache.nix b/machines/orbi/service-nix-cache.nix
index 950e200..b4cabc8 100644
--- a/machines/orbi/service-nix-cache.nix
+++ b/machines/orbi/service-nix-cache.nix
@@ -40,11 +40,13 @@
         allow ${config.wireguard.wg0.subnet};
         deny all;
       '';
+      # curl https://cache.nixos.org/nix-cache-info
+      # lower priority means ask first.
       locations."= /nix-cache-info".extraConfig = ''
         alias ${pkgs.writeText "cache-info" ''
           StoreDir: /nix/store
           WantMassQuery: 1
-          Priority: 10
+          Priority: 50
         ''};
         allow ${config.wireguard.wg0.subnet};
         deny all;