V1 - Schematics use OHL-S. Should be "CERN-OHL-W-2.0+"
Javier recommends to use -W.
https://ohwr.org/project/ohr-meta/wikis/home#hardware :
We recommend you use W with the "or later" suffix, i.e. license your designs as "CERN-OHL-W-2.0+" (see SPDX codes). The '+' at the end stands for "or later". It means that a licensee can take your design as being licensed under CERN-OHL-W-2.0 or any later version CERN publishes of the same W variant. This will allow your design to benefit from future improvements in the licence.