Present participle of 'annotate': the act of adding explanatory notes, comments, or markings to a text or document.
From 'annotate' (from Latin 'annotare') plus the present participle suffix '-ing.' This form emphasizes the ongoing action of making annotations rather than the completion of the task.
The rise of digital 'annotating' apps shows how an ancient practice—marginalia—evolved from paper to pixels; scholars still aren't happy with pre-printed books without blank margins, so we built tools to add margins to digital texts.
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