DOMAIN allows you to create a comment for every object you own. All users who are authorized to view an object can also read the object's comment.
Using the Edit / Comment function or the 
toolbar button, you can create (as the owner) or view the comment in all object lists, including those in the relationship
display. If the object does not have a comment, an empty editing window is displayed in which the owner of the object can enter and save a comment.
The menu bar of the comment window provides the known editing functions. Use the File (Load Text or Save Text) menu item to load the comment from or write it to a file.
The comment can also be accessed in design mode. In the case of more complex objects (e.g., tables), select the Edit / Comment menu item to display a submenu from which you must select either Table or the individual, associated subobjects Column, Constraint, Foreign Key, Index, and Trigger. If the Column object is selected, you can choose either the table comment or the column comment.
If you like, you can also view the comments of all objects within an object list by selecting the View / Options function and activating the Show Comments in Object Lists option under More Options.