The idea
A free-text notes field on each source in your library. Write whatever you want — a summary in your own words, a reminder of why you saved it, a flag for a specific page number. Notes are private, searchable, and appear in the source panel alongside the metadata.
Why it matters
Researchers annotate their sources. That's a basic part of the workflow. Right now, those annotations live in a separate app, a spreadsheet, or a sticky note on the desk. They should live next to the source — in the same tool where you're citing it. When you're deep in a literature review and you need to remember why you saved a paper three weeks ago, a quick note beats re-reading the abstract.
Where we are
This feature shipped. Source notes are available in your source library panel. Add a note to any source from the source detail view.