22 Therefore, having invoked the Holy Spirit, by Our Supreme Authority, We confer upon St. Ephrem the Syrian, Deacon of Edessa, the title and the honors of Doctor of the Universal Church. We decree that his feastday, which is the 18th of June, is to be celebrated everywhere the birthdays of the other doctors of the Universal Church are celebrated.
Source: Principi Apostolorum Petro (Vatican.va)