diff --git a/modules/secureboot.nix b/modules/secureboot.nix
index 210eaa0..cd8856e 100644
--- a/modules/secureboot.nix
+++ b/modules/secureboot.nix
@@ -1,3 +1,4 @@
+# based on https://tangled.org/ed209.dev/nix-config/blob/c68d0f252cb126cbe0540cb7a1709e8294777c1c/modules/nixos/system/boot/default.nix
 {
   config,
   lib,