How do you write a letter of explanation for not informing your co- employee for his new schedule?

In your letter of explanation, start by acknowledging the oversight and expressing your regret for not informing your co-worker about the new schedule. Clearly state the reasons for the lapse, whether it was an oversight or miscommunication, and ensure you take responsibility for it. Offer reassurance that you will improve communication in the future, and invite any questions or concerns they may have regarding the schedule change. End on a positive note, expressing your commitment to teamwork and support.