1) Clarifying 2) Informative 3) Instructive 4) That makes clear 1) Clarifying 2) Instructive 
• (a.) Making clear; tending to elucidate; as, an elucidative note.
E·lu'ci·da`tive adjective Making clear; tending to elucidate; as, an elucidative note. 
elucidation, elucidative The act of explaining or clarifying; throwing light upon; making plain or intelligible. Etymologically related 'light, shine, glow' word families: ethero-; fulg-; lumen-, lum-; luna, luni-; lustr-; phengo-; pheno-; phospho-; photo-; scinti-, scintill-; splendo-.