Attachments when render a form

I recently join adobe livecycle platform and i using it to develop an application that uses forms.<br /><br />I want to permit attachments in my forms but i find and issue that i can´t manage. Seems like newbie question but i read km of documentation and my dubt persists.<br /><br />I want to put a description for my attachments when render a form but seems that Map<String, Document> that i pass on renderForm method dont have any maner of indicate this.<br /><br />I really apreciate any help in this direcction. Some manual or something that  i miss.<br /><br />Thank you in advance for any help.<br />Cheers.