Flatband is everywhere. A tight-binding Hamiltonian of a pentagon network of atoms is proposed that possesses a flat band (although it needs fine-tuning) in our recent paper, “Evolution of flat bands in a two-dimensional fused pentagon network” by Tomonari Mizoguchi, Mina Maruyama, Yasuhiro Hatsugai, and Susumu Okada. It has been accepted for publication in Physical Review B on 16 July, 2025. See also arXiv:2411.17092.