diff --git a/asus/zephyrus/ga402x/ATTR-SET-DEPRECATION.md b/asus/zephyrus/ga402x/ATTR-SET-DEPRECATION.md
new file mode 100644
index 0000000..21d3d1e
--- /dev/null
+++ b/asus/zephyrus/ga402x/ATTR-SET-DEPRECATION.md
@@ -0,0 +1,16 @@
+# Deprecation of //asus/zephyrus/ga402x/default.nix
+
+Background:
+The `asus-zephyrus-ga402x` provides an attr-set with `amdgpu` and `nvidia` entries, to allow users
+to choose whether to enable only the AMD-GPU driver, or also enable the NVidia driver with (by
+default) Prime enabled.
+
+However, this attr-set style seems to be broken by [PR #1046](https://github.com/NixOS/nixos-hardware/pull/1046),
+which exports modules as paths, instead.
+That change seems to cause an error of "value is a path while a set was expected".
+
+[PR #1053](https://github.com/NixOS/nixos-hardware/pull/1053):
+- Replaced `asus-zephyrus-ga402x.amdgpu` with a `asus-zephyrus-ga402x-amdgpu` entry.
+- Replaced `asus-zephyrus-ga402x.nvidia` with a `asus-zephyrus-ga402x-nvidia` entry.
+- Made `asus-zephyrus-ga402x` throw a deprecation error.
+- [FIXES: #1052](https://github.com/NixOS/nixos-hardware/issues/1052)
diff --git a/asus/zephyrus/ga402x/default.nix b/asus/zephyrus/ga402x/default.nix
index a77e24d..e4e681e 100644
--- a/asus/zephyrus/ga402x/default.nix
+++ b/asus/zephyrus/ga402x/default.nix
@@ -4,7 +4,7 @@
   assertions = [
     {
       assertion = false;
-      message = "Importing asus/zephyrus/ga402x/ (default.nix) directly is deprecated! #TODO: More details";
+      message = "Importing asus/zephyrus/ga402x/ (default.nix) directly is deprecated! See https://github.com/NixOS/nixos-hardware/blob/master/asus/zephyrus/ga402x/ATTR-SET-DEPRECATION.md for more details";
     }
   ];
 }