Version 1.1 of the PCI Secure Software Standard introduces the Terminal Software Module. Modules are groups of requirements that address specific use cases. Software intended for deployment and operation on PIN Transaction Security (PTS) Point-of-Interaction (POI) devices is not affected by the new requirements. The Terminal Software module is the third module to be incorporated into the modular requirements architecture. PCI SSC expects to introduce additional modules in the future. It also addresses errata, adds minor clarifications, and aligns key terms and definitions across the Standard and program documentation.
Source: https://www.helpnetsecurity.com/2021/05/03/pci-secure-software-standard-1-1/