The keywords TIMER5_OFF and TIMER5_ON from the ATmega2560 IDLE [periodic wakeup example](https://github.com/rocketscream/Low-Power/blob/master/Examples/idleWakePeriodic/idleWakePeriodic.ino) line 24 aren't defined in the [Keyword.txt](https://github.com/rocketscream/Low-Power/blob/master/keywords.txt) doc.
The keywords TIMER5_OFF and TIMER5_ON from the ATmega2560 IDLE periodic wakeup example line 24 aren't defined in the Keyword.txt doc.