diff --git a/modules/programs.nix b/modules/programs.nix
index b781690..17a2dec 100644
--- a/modules/programs.nix
+++ b/modules/programs.nix
@@ -2,6 +2,7 @@
 
 {
   # Don't install all programs of the GNOME desktop.
+  # https://nixos.wiki/wiki/GNOME#Excluding_some_GNOME_applications_from_the_default_install
   environment.gnome.excludePackages = (with pkgs; [
     gnome-photos
     gnome-tour