End of course is not obvious

Hi, Based on your system, we set up courses in it it has many units. However when user is on the last unit, once u click 'mark unit completed ' - it does nothing ( as there is no more new units to go forward ) - i just think the 'ending of the course' is not obvious, and it simply is odd for users < in my case>. What can you suggest that it can 'take u to an ending page' - as the finish course button is not obvious and it should be more automatic - like automatically inform a user this is the last of the units and that course has ended? as my course has no assignments, and no quiz - . it does not need any submission for any markings.