The Diploma Supplement is a document attached to a higher education or college diploma that with the purpose to facilitates understanding of its holder's qualifications from the perspective of acquired skills and competences. The Diploma Supplement can not substitute the original diploma, but aims to improve the transparency of qualifications and thereby promote recognition.

The Diploma Supplement is an important tool in the recognition of diplomas, especially of those originating from other countries. The eight sections provide : the information about the document holder, his/her completed education (including the level of qualification), details about contents of the study programme and performance of the holder, information about possibilities for the continuation of the studies and about possible employment, as well as some information about the Bulgarian education system. The Diploma Supplement is an individual document as it is compiled differently for every individual, depending on chosen subjects and exams passed. It follows the model developed by the European Commission, Council of Europe and UNESCO/CEPES.  It should be free from any value judgements, equivalence statements or suggestions about recognition.