Explain the background requisite for understanding the decision that is being made. Imagine someone is brand new to the project and trying to understand what the decision was, why it had to be made.
If there were options between different technologies, include those here as well as any research highlights that might be relevant. For example, when choosing one library over another, what did each off in the way of pros and cons?
What decision was made and why did you decide to go that route?