Linodef tags support comments. Comments are for those who want to get a better idea of the purpose of a Linodef tag during editing. Therefore the comment has the following characteristics:

• it is only visible while editing a node
• it is not loaded when viewing a node so no one is able to see the comment by viewing a node
• it may contain any UTF-8 character except ]
• it is not modified automatically (e.g. when the element content gets an update) and therefore will not change unless the editor changes it manually

Easteregg: You may use [# your comment] to create an inline comment that is visible only when editing the node.