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note

Notes vs. marks

Two different annotation primitives, often confused, with very different design implications.

October 20, 2025 updated October 29, 2025 ↳ margin tools for thought

A mark is a gesture — underline, dog-ear, asterisk. It is information about where, not what. The reader marks a paragraph because something happened there; the what is recoverable from re-reading.

A note is prose. It contains an idea that the original text does not. The note can survive without its anchor, and frequently outlives it.

Most reader software collapses the two into a single thing called “highlight.” This is the source of an enormous amount of grief, because the affordances each wants are different:

  • Marks want to be invisible until you scan for them, fast to make, positionally exact, and quietly indexable.
  • Notes want to be visible while you read, expandable, full text, and network-connectable to other notes.

For Margin I’m leaning toward two distinct primitives, and a small ritual — a promotion — by which a mark becomes a note when the reader decides it deserves prose.

See the related discussion in A reader's stance § a small list of things.