Add acknowledgement step to timecard submission

Summary: Is it possible to add an acknowledgment statement to the employee timecard? We would like the employee to click an acknowledgement of hours between click 'Next' and 'Submit' when submitting a timecard. Is this possible

Content (required): employee enters time on timecard. clicks 'Next'. a popup window appears (or something) with an acknowledgement statement (e.g. have a yes/no check boxes) that must be checked before clicking submit.

Version (include the version you are using, if applicable): we are currently on 21D