Add short description for flag (#39111).

git-svn-id: https://svn.redmine.org/redmine/trunk@22785 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/environments/production.rb

@@ -94,5 +94,6 @@ Rails.application.configure do
   # No email in production log
   config.action_mailer.logger = nil
 
+  # Automatically execute asset precompilation on startup in case of changes have been detected in assets
   config.assets.redmine_detect_update = true
 end