What is the standard of review for attorney's fees?

"The standard of review of an award of attorney's fees is highly deferential to the district court." Mautner v. Hirsch, 32 F.3d 37, 39 (2d Cir. 1994). "What constitutes a reasonable fee is properly committed to the sound discretion of the district court, and will not be overturned absent an abuse of discretion, such as a mistake of law or a clearly erroneous factual finding." Goldberger v. Integrated Res., Inc., 209 F.3d 43, 47 (2d Cir. 2000) (citation omitted). We review a district court's denial of punitive damages for an abuse of discretion. See Payne v. Jones, 711 F.3d 85, 97-98 (2d Cir. 2013).