 However, some have noted that Banneker's actual role in the survey is uncertain, as his involvement in the effort "rests on extremely meager documentation".An April 21, 1791, news report of the April 15 dedication ceremony for the first boundary stone (the south cornerstone) stated that it was Andrew Ellicott who "ascertained the precise point from which the first line of the district was to proceed".The news report did not mention Banneker's name.