‘Call about the thing before Thursday.’ When you wrote it, this was a complete thought—you knew the person, the thing, and which Thursday. The note has not changed since. What changed is you: the surrounding situation that made it obvious has been replaced by dozens of newer ones. Notes do not rot. Context evaporates.
Meaning decays in a predictable order
The first casualties are pointers: he, she, it, this, the other one. Within weeks, ‘ask him about the estimate’ has three plausible hims. Next go the time anchors—‘tomorrow’, ‘after the call’, ‘next sprint’—which become unreadable the moment the reference week is forgotten. The reasons and stakes fade last, but they fade too: the note survives while the problem it was solving becomes invisible.
The words that age worst
Certain phrasings are almost designed to expire. They feel efficient at capture time precisely because they lean on context you currently have.
- Pronouns without names: ‘she said it’s fine.’
- Relative dates: ‘tomorrow’, ‘in two weeks’, ‘after the holidays’.
- Unnamed referents: ‘the document’, ‘that option’, ‘the second version’.
- Conclusions without their question: ‘42 is fine’—fine for what?
Media notes decay fastest of all
A photo of a whiteboard, a screenshot, a forwarded message—each depends entirely on remembered context, because the item contains no statement of purpose at all. One sentence of ‘why I saved this’ multiplies a media note’s lifespan.
Insurance is cheap at capture time, expensive later
The fix is not writing formal notes—it is spending ten extra seconds on the parts that decay first: a name instead of a pronoun, a date instead of ‘tomorrow’, a half-sentence of why. And when you skip that, a timely clarification question—asked while you still remember—repairs the note at a fraction of the future cost.
Write for the person you will be in six months: name the people, date the times, and state the why in half a sentence. That person remembers nothing you currently know.