diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 20e90ae126e..67f78b1bbba 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -105,6 +105,7 @@ class UsersController < ApplicationController
     show(for_card: true)
   end
 
+  # This route is not used in core, but is used by theme components (e.g. https://meta.discourse.org/t/144479)
   def cards
     return redirect_to path('/login') if SiteSetting.hide_user_profiles_from_public && !current_user