If you want to link an existing extended notes to other objects in your database without modifying the contents of the note, the addlink command comes in handy. The command requires at least two arguments. The first argument specifies an existing note by its ID or citation key. The second argument specifies an object in the database, either a reference by ID or citation key, or an author name, a keyword, or a periodical by their names. Removing links works just the same except that you need to provide the -r switch.