diff --git a/morph/README.rst b/morph/README.rst
index 6fd00a93a0315d64b1e1aa6d33dc79345cb65b0a..3bb77dca9552533fdfe72494d232bf5abe365811 100644
--- a/morph/README.rst
+++ b/morph/README.rst
@@ -52,6 +52,7 @@ starting from a minimal NixOS 19.03 or 19.09 installation.
 
 #. Copy ``/etc/nixos/hardware-configuration.nix`` to ``storageNNN-hardware.nix``.
    In the case of an EC2 instance, copy ``/etc/nixos/configuration.nix`` instead.
+#. Add ``"zfs"`` to ``boot.supportedFilesystems`` in ``storageNNN-hardware.nix``.
 #. Create a ``storageNNN-config.nix`` containing further configuration for the new host.
 #. Add an entry for the new host to ``grid.nix`` referencing the new files.
 
diff --git a/morph/testing001-hardware.nix b/morph/testing001-hardware.nix
index 9c79ca12604d3046947a8b8977c75a2886ea0d3d..c00834cf4bd1a623f24784b99169d5b654754d1d 100644
--- a/morph/testing001-hardware.nix
+++ b/morph/testing001-hardware.nix
@@ -2,4 +2,6 @@
   imports = [ <nixpkgs/nixos/modules/virtualisation/amazon-image.nix> ];
   ec2.hvm = true;
 
+  boot.supportedFilesystems = [ "zfs" ];
+  networking.hostId = "10000000";
 }