Submissions for a change to the International Edition of SNOMED CT should be supported by at least one reference. The reference can be added to the justification field in the request template. Please remember that requests for change need to be of international relevance and not confined to one member country. The supporting information submitted with the request is required to be recent and from an authoritative source such as a scientific or professional journal, OMIM, PubMed, Orphanet or a professional society. References to Wikipedia are not sufficient. Literature intended for patient education purposes should not be used in support of a request; it frequently includes generalizations that are not always true but may be true in the context of the topic being addressed.