When a project manager identifies stakeholders who will be impacted by the delivery of a new product, it is important to update the communication plan to reflect these findings. This ensures that all stakeholders are informed about the project's progress and how it may affect them, fostering transparency and managing expectations.
References = The answer is based on standard project management practices and the typical use of communication plans in stakeholder management. For detailed information, please refer to the CompTIA Project+ Study Guide and other official CompTIA resources.