a) The role of commentator should properly be carried out by a priest or at least a cleric. If none is available, a layman of good Christian character, and well instructed in his duties may fill the role. Women, however, may never act as commentator; in case of necessity, a woman would be permitted only to lead the prayers, and singing of the congregation.
b) If the commentator is a priest or a cleric, he should wear a surplice, and stand in the sanctuary or near the Communion rail, or at the lectern or pulpit. If he is a layman, he should stand in a convenient place in front of the congregation, but not in the sanctuary or in the pulpit.
c) The explanations and directions to be given by the commentator should be prepared in writing; they should be brief, clear, and to the point; they should be spoken at a suitable time, and in a moderate tone of voice; they should never interfere with the prayers of the priest who is celebrating. In short, they should be a real help, and not a hindrance to the devotion of the congregation.
d) In directing the prayers of the congregation, the commentator should recall the prescriptions given above in paragraph 14c.
e) In those places where the Holy See has permitted the reading of the Epistle and Gospel in the vernacular after the Latin text has been chanted, the commentator may not substitute for the celebrant, deacon, or subdeacon in reading them.
f) The commentator should follow the celebrant closely, and so accompany the sacred action that it is not delayed or interrupted, and the entire ceremony carried out with harmony, dignity, and devotion.