An Architectural Decision (AD) is a justified software design choice that addresses a functional or non-functional requirement that is architecturally significant.
This was done by Michael Nygard, author of release it!
More details:
- https://adr.github.io/
- https://github.com/mtnygard/adr-tools
- https://cognitect.com/blog/2011/11/15/documenting-architecture-decisions