diff --git a/tvix/boot/tests/default.nix b/tvix/boot/tests/default.nix
index 974775720..64b2f7f52 100644
--- a/tvix/boot/tests/default.nix
+++ b/tvix/boot/tests/default.nix
@@ -1,9 +1,10 @@
 { depot, pkgs, lib, ... }:
 
 let
-  # Seed a tvix-store with the tvix docs, then start a VM, ask it to list all
-  # files in /nix/store, and ensure the store path is present, which acts as a
-  # nice smoketest.
+  # Seed a tvix-store with the specified path, then start a VM with the
+  # tvix-boot initrd.
+  # Allows customizing the cmdline, which can be used to list files,
+  # or specify what init should be booted.
   mkBootTest =
     { blobServiceAddr ? "memory://"
     , directoryServiceAddr ? "memory://"