A comment is descriptive text that you insert in HTML code to explain the code or provide other information. The text of the comment appears only in Code view and is not displayed in a browser.
In Code view, Dreamweaver inserts a comment tag and places the insertion point in the middle of the tag. Type your comment.
In Design view, Dreamweaver displays the Comment dialog box. Type your comment and click OK.
Make sure that the Comments option is selected in the Invisible Elements preferences or the comment marker will not appear.