TOPIC: Can the communication plan change mid-project?

Hi all. I’m prepping for the PMP and trying to make sense of how the communication plan fits into the bigger picture.

From what I understand, once the project charter is approved, you move into creating the full project management, which includes the communication plan. I’ve read that once the plan is accepted, any changes need to go through a change control board.

But then I saw something in Study Hall that threw me off. It said it’s more practical to build out communication content gradually as the project progresses, and to keep everything in one place for easy access. That sounds like the plan can evolve over time, which seems to contradict the idea of needing formal change approval.

Can someone help clarify this? Is the communication plan meant to be flexible, or is it locked once approved?

Appreciate any insights.