Also keep in mind that if you do not want any 401k contributions taken out of your bonus you will need to change your contribution rate to 0% in the BOL app by the EOM Jan. Unfortunately, because both paychecks and bonuses land on the same day, that means your paycheck 401k contribution will be 0% as well, so make sure you remember to change it back right after the 15th of Feb.
This was posted by @1ych+1eTAgop8, I had to reposted it for more people to see. This is an important reminder, especially the "change it back" part.