The appearance in print in 2016 of an unknown manuscript of the notes of Blessed Bishop Hryhoriy Khomyshyn, a Greek Catholic ordinary of Stanyslaviv, aroused enormous interest in various academic and church circles. The materials contained in the document provide a lot of new information about the Greek Catholic Church in the Second Polish Republic, the situation of the Ukrainian population, and the relationship between the Stanyslaviv bishop and the metropolitan of Lviv, Archbishop Andrey Sheptytsky. The article presents the history of the discovery of the manuscript, its fate after World War II, as well as the main themes discussed by the author in the document.