diff --git a/nixos/lib/eval-config.nix b/nixos/lib/eval-config.nix
index 3e07df6c086..a87b285c5b7 100644
--- a/nixos/lib/eval-config.nix
+++ b/nixos/lib/eval-config.nix
@@ -54,11 +54,6 @@ in rec {
 
   # These are the extra arguments passed to every module.  In
   # particular, Nixpkgs is passed through the "pkgs" argument.
-  # FIXME: we enable config.allowUnfree to make packages like
-  # nvidia-x11 available. This isn't a problem because if the user has
-  # ‘nixpkgs.config.allowUnfree = false’, then evaluation will fail on
-  # the 64-bit package anyway. However, it would be cleaner to respect
-  # nixpkgs.config here.
   extraArgs = extraArgs_ // {
     inherit modules baseModules;
   };
diff --git a/nixos/modules/misc/extra-arguments.nix b/nixos/modules/misc/extra-arguments.nix
index 02ac6e7a59d..19002b17dac 100644
--- a/nixos/modules/misc/extra-arguments.nix
+++ b/nixos/modules/misc/extra-arguments.nix
@@ -4,6 +4,11 @@
   _module.args = {
     pkgs_i686 = import ../../.. {
       system = "i686-linux";
+      # FIXME: we enable config.allowUnfree to make packages like
+      # nvidia-x11 available. This isn't a problem because if the user has
+      # ‘nixpkgs.config.allowUnfree = false’, then evaluation will fail on
+      # the 64-bit package anyway. However, it would be cleaner to respect
+      # nixpkgs.config here.
       config.allowUnfree = true;
     };