Recently, a review paper titled "Mid-Infrared Free-Space Optical Communications: A Review" was published in the journal Advances in Optics and Photonics by a team led by academician Alan E. Willner from the University of Southern California, in collaboration with researchers from TOPTICA Photonics and Tel Aviv University in Israel. The paper provides a comprehensive overview of the development history of mid-infrared free-space optical communications. It delves deeply into key technologies, including the effects of mid-infrared atmospheric transmission, transmission and reception devices, and demonstrations of single-channel and multi-channel high-speed links. Furthermore, it analyzes the current technological bottlenecks and proposes future research directions. Mid-infrared free-space optical communications hold immense potential in areas such as communication under harsh weather conditions and integrated air-space-ground communications. They are expected to offer substantial technical support for high-speed, reliable wireless optical communications in complex atmospheric environments.