P.R. Laws Ap. tit. 32A, § III, Rule 36.5
Affidavits supporting and opposing the motion shall be made on personal knowledge. They shall set forth such facts as would be admissible in evidence, and shall show affirmatively that the affiant is competent to testify to the matters stated therein. Sworn or certified copies of all papers or parts thereof referred to in an affidavit shall be attached thereto or served therewith. The court may permit affidavits to be supplemented or opposed by depositions or further affidavits. When a motion for summary judgment is made and supported as provided in this Rule 36, the adverse party may not rest upon the mere allegations or denials of his pleadings, but his response must be as detailed and specific as the moving party’s would have been, and must set forth such facts pertinent to the controversy as show that there is a genuine issue for trial. If he does not so respond, summary judgment, if appropriate, shall be entered against him.