You can place text labels anywhere on your diagram. You can add simple text labels for descriptions, titles, and notes.

Label text can contain any combination of fonts, size, color, bold, italic, underline, subscript, and superscript. All text attributes can be edited right on screen in WYSIWYG fashion. Labels can also be rotated 90 degrees toward either side for vertical labeling.
Plus you can add several types of specialty labels that stick to other objects in your diagram and reposition automatically when the objects move.
Specialty labels include: