You can put notes into your diagram, to describe the diagram and its objects. These can include headings, descriptions of the tables and their contents, and any other information you want to place in the diagram.
To add annotations to a diagram
To change the font of the annotation
Note All text in the text annotation box will be changed to the new font.
To arrange the text annotation in a diagram
Tip You can use annotations to describe the relationships between tables in your diagram. However, you can also generate relationship labels automatically. For more information, see Adding Labels to Relationship Lines.