- 'description' => 'Global username uniqueness control: none (usual setting - check uniqueness per exports), username (all usernames are globally unique, regardless of domain or exports), or username@domain (all username@domain pairs are globally unique, regardless of exports)',
+ 'description' => 'Global username uniqueness control: none (usual setting - check uniqueness per exports), username (all usernames are globally unique, regardless of domain or exports), or username@domain (all username@domain pairs are globally unique, regardless of exports). disabled turns off duplicate checking completely and is STRONGLY NOT RECOMMENDED unless you REALLY need to turn this off.',