An important aspect of an architecture is not just the end result, the architecture itself, but the rationale for why it is the way it is. Thus, an important consideration is to ensure that you document the decisions that have led to this architecture and the rationale for those decisions.
This information is relevant to many stakeholders, especially those who must maintain the system. This information is often valuable to the architect when he or she needs to revisit the rationale behind the decisions that were made, so that they don't end up having to unnecessarily retrace steps. For example, this information is used when the architecture is reviewed and the architect needs to justify the decisions that have been made.