to be clear

To be clear, this is a voluntary programme—no one is required to participate.说清楚一点，这是一个自愿的项目——没有人被要求必须参加。

To be clear, the deadline has not changed and all deliverables are still expected on Friday.明确一下，截止日期没有改变，所有交付物仍需在周五按时提交。