Write it down. If you think you will remember. Write it down. If you don’t think it’s an important detail. Write it down. If the pad of paper is allllll the way downstairs. Get up, get it, and write it down. If the pen rolled under the ironing board. Get up, get it, and write it down. Really.
Just spent way too long re-inventing a pattern because, well, last time? Didn’t write it down.
Corollary: Remember where you wrote it down!