When should I use a ellipsis in a Menu Item

Question

When should I put ... at the end of a menu item? I seem to remember reading some rules but can't for the life of me find them.

For context - I'm adding a properties option to a right click menu and am wondering if it is appropriate to add them.

Answer 1

When the option will send the user to some sort of dialog where the user has to do something before a real change is made. Options without the ellipse take effect immediately.

For example, 'Save' doesn't have an ellipsis, while 'Save As...' does because the user has to input the new name/location of the file.