Anyone who finds an error should report it to the SRFI's discussion mailing list. That way, it will be recorded publicly.
If the author agrees to a correction and it is straightforward, we'll revise the document itself. See the example of SRFI 117.
Otherwise, or until the author has expressed an opinion, we add a link to an errata page to the Status section. See the example of SRFI 48. That way, the document remains unchanged, but everyone can easily find the correction.
In either case, a tag like
errata-1is added in the Git repository.