verb

give (someone) greater knowledge and understanding about a subject or situation.

Christopher had not enlightened Francis as to their relationship

inform,make aware,notify,tell,advise,let know,illuminate,open someone’s eyes,apprise,explain the situation to,explain the circumstances to,brief,update,give details to,give information to,bring up to date,clue in,fill in,put wise,tip off,put in the picture,bring up to speed