diff --git a/app/services/application_service.rb b/app/services/application_service.rb
index 6185f03..401fe02 100644
--- a/app/services/application_service.rb
+++ b/app/services/application_service.rb
@@ -1,4 +1,6 @@
 class ApplicationService
+  # This enables executing a service's `#call` method directly via
+  # `MyService.call(args)`, without creating a class instance it first.
   def self.call(*args, &block)
     new(*args, &block).call
   end