a few more comments and formatting changes

morph/storage000.nix

 let
+  # Get the configuration that's specific to this node.
   cfg = import ./storage000-config.nix;
 in
-{ publicStoragePort, ... }:
-{
-  imports =
-    [ # Include the results of the hardware scan.
+# Define the function that defines the node.  Accept the public storage server
+# port argument so we can configure Tahoe-LAFS with it.  Accept but ignore any
+# other arguments.
+{ publicStoragePort, ... }: {
+
+  # Any extra NixOS modules to load on this server.
+  imports = [
+    # Include the results of the hardware scan.
     ./storage000-hardware.nix
     # Configure it as a system operated by 100TB.
     ../nixos/modules/100tb.nix
@@ -22,8 +27,9 @@ in
   "100tb".config = cfg;
 
   # Turn on the Private Storage (Tahoe-LAFS) service.
-  services.private-storage =
-  { enable = true;
+  services.private-storage = {
+    # Yep.  Turn it on.
+    enable = true;
     # Get the public IPv4 address from the node configuration.
     inherit (cfg) publicIPv4;
     # And the port to operate on is specified via parameter.