diff --git a/pkgs/default.nix b/pkgs/default.nix
index 2de3e84..73bb476 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -1,5 +1,9 @@
 { callPackage }:
 {
+  # Create a cpio archive comprised of many initrd's appended to
+  # each other. Harder to debug, and requires recursive Nix support,
+  # but faster for iterating.
   makeCpioRecursive = callPackage ./cpio-recursive {};
+
   makeSquashfsManifest = callPackage ./squashfs-recursive {};
 }