What does it mean to add notes to a text or diagram for clarification?

Adding notes to a text or diagram for clarification is referred to as annotating. Annotation involves writing explanations, comments, or critiques directly on the text or alongside diagrams to enhance understanding. This process helps to clarify complex ideas, highlight important information, and provide context that aids in comprehension.

In contrast, summarizing is about condensing the main points of a text or diagram into a shorter form, which does not involve adding additional notes or commentary. Illustrating refers to creating visual representations to explain or clarify concepts, while exemplifying involves providing specific examples to clarify or support a statement. Both of these last two terms don't specifically involve the addition of notes for clarification as annotation does. Thus, the term that best fits the action of adding explanatory notes is annotation.