diff --git a/nixos/system/all/defaults.nix b/nixos/system/all/defaults.nix
index 688d9a3..32020f2 100644
--- a/nixos/system/all/defaults.nix
+++ b/nixos/system/all/defaults.nix
@@ -49,4 +49,11 @@
   # -----------------------------
   programs.vim.defaultEditor = true;
 
+  # extra hosts
+  # /etc/hosts
+  networking.extraHosts = ''
+    ${config.module.cluster.services.tinc.private.hosts.robi.tincIp} transmission.robi.private
+  '';
+
+
 }
diff --git a/nixos/system/all/packages.nix b/nixos/system/all/packages.nix
index 8138bf8..dd8a429 100644
--- a/nixos/system/all/packages.nix
+++ b/nixos/system/all/packages.nix
@@ -55,6 +55,7 @@ in
     # to browse logs better
     lnav
 
+    nix-tree
     nixos-option
 
     storepath