Vista - Explorer Comments

Using XP I am able to set up a "Comments" column in the right pane of
Windows Explorer. Then, when I bring up the properties page of a file there
is a "Summary" tab that allows the input of a comment which then appears in
the Explorer right pane.

Under Vista I can set up the"Comments" column but I can't figure out how to
enter a comment. There is no Summary tab on the properties page.

Can someone tell me how to make the Commens column accessible?

--Larry P.