diff --git a/nixos/roles/hardware.nix b/nixos/roles/hardware.nix
index 1c678b6..f182583 100644
--- a/nixos/roles/hardware.nix
+++ b/nixos/roles/hardware.nix
@@ -1,4 +1,6 @@
 {
-  # Bootloader
+  # Use grub as bootloader.
+  # Systemd-boot does not support our legacy BIOS hardware,
+  # but only runs on UEFI systems.
   boot.loader.grub.enable = true;
 }