epexegetic

/ˌɛpɛksɪˈdʒɛtɪk/
adjective
  1. Serving to explain or clarify further; providing additional explanation.
    • His epexegetic style of writing made complex ideas accessible to beginners.
    • The teacher's epexegetic comments helped the students understand the difficult poem.
    • In the margin, she wrote an epexegetic note explaining the symbolism.