In Dion v. Board of Appeals of Waltham, 344 Mass. 547, 183 N.E.2d 479 (1962), the Board granted a variance and then privately amended the decision 17 days later by further elaborating the reasons for their decision. Dion, 344 Mass. 547, 550, 183 N.E.2d 479. The court found that it had been an inadvertent mistake on the part of the Board to leave this explanation out of the original decision. Dion, 344 Mass. 547, 183 N.E.2d 479. Additionally, it was not a reversal of a conscious decision, did not grant a different form of relief, nor were any of the parties prejudiced by the addition. Dion, 344 Mass. 547, 183 N.E.2d 479. It was therefore not subject to the regulations of the open meeting law. Dion, 344 Mass. 547, 183 N.E.2d 479.