I have paid for the yearly plan. Why did I receive another invoice?

This can happen if you add members after starting an annual plan. Each member counts as a paid seat, so added seats create prorated annual-plan adjustments. Depending on the amount due and the timing of the change, GitBook might include those charges in a true-up or send an additional invoice straight away. For the current rules on prorating, annual-plan adjustments, and when GitBook sends an additional invoice immediately, see our Billing policy.