You can add a note to a unit to comment on it or describe it. The note does not affect the function of the topology elements.
To create a note, click Note or Text in the Palette and use the mouse to drag a rectangle that represents the note on the diagram. For attached notes, click Note Attachment and then click the unit or link to which the note will be attached. Then, type the text for the note.
You can add three types of notes to a diagram: