A recent Department of Labor (DOL) opinion letter tackled the question of how to track time when nonexempt employees take mandatory online training on their home computers. A company asked if that time can simply be added to employees’ time sheets.

The answer: Paper time sheets are fine. The Fair Labor Standards Act mentions that all time spent working must be paid for, including hours worked at home, as long as the employer “knows or has reason to believe” the work is being done.

But it doesn’t tell companies how that time needs to be tracked, as long as the information is collected and can be preserved. Therefore, the DOL said, old-fashioned paper time sheets still get a passing grade.

Read the opinion letter here.