diff --git a/hosts/home/hardware-configuration/default.nix b/hosts/home/hardware-configuration/default.nix
index 9aa5158..4177707 100644
--- a/hosts/home/hardware-configuration/default.nix
+++ b/hosts/home/hardware-configuration/default.nix
@@ -35,6 +35,9 @@
 
   # All monitors in the right order
   # Source: https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/x11/xserver.nix#L83
+  #
+  # To see references use the following command
+  # man xorg.conf
   services.xserver.xrandrHeads = [
     {
       output = "DP-3";