diff --git a/config/configuration.yml.example b/config/configuration.yml.example
index 3c942387d..ac127a4b5 100644
--- a/config/configuration.yml.example
+++ b/config/configuration.yml.example
@@ -153,12 +153,6 @@ default:
   # * encrypt data using 'rake db:encrypt RAILS_ENV=production'
   database_cipher_key:
 
-  # Set this to false to disable plugins' assets mirroring on startup.
-  # You can use `rake redmine:plugins:assets` to manually mirror assets
-  # to public/plugin_assets when you install/upgrade a Redmine plugin.
-  #
-  #mirror_plugins_assets_on_startup: false
-
   # Your secret key for verifying cookie session data integrity. If you
   # change this key, all old sessions will become invalid! Make sure the
   # secret is at least 30 characters and all random, no regular words or