He then added a final section, Lux aeterna by adapting the opening two movements which Mozart had written to the different words which finish the Requiem mass, which according to both Süssmayr and Mozart's wife was done according to Mozart's directions.
Zatim je dodao poslednji deo, Lux aeterna, tako što je prilagodio uvodna dva stava koje je Mocart napisao drugačijim rečima kojima se završava Rekvijem, što je prema rečima Sismajera i Mocartove supruge, obavljeno prema Mocartovim uputstvima.