Pretty self-explanatory: in Renoise’s “About…” window, add a simple line right below “Renoise 64-bit - V…”, something like “Renoise Tools API V6.1…”, to give a user quick information about what the current API version is.
It would make it easier for people who need that information quickly, and would help avoid the need to do a search online, or to open up a bunch manifest.xml files. At the very least, it would make the “About…” window look more complete.