You an add a caption to a dashboard or view by selecting Worksheet > Show Caption from the menu.
Double click the caption to edit the text within.
Hope that helps,
Thanks Robin .
Adding caption to dashboard we do when we develop the dashboard.but in the server side there is an option to add comments when view the dashboard.
Actually I want to know is there any way to store this comments.
This would be a good one to add to the Ideas section! Currently, the comments can only be seen through the view that they are associated with.