Catechism of the Catholic Church §1320 — excerpt
The essential rite of Confirmation is anointing the forehead of the baptized with sacred chrism (in the East other sense-organs as well), together with the laying on of the minister's hand and the words: "Accipe signaculum doni Spiritus Sancti" (Be sealed with the Gift of the Holy Spirit.)
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.