such as '-*' and "-amd64 keyword" should be mentioned in the MASKED PACKAGES section. some is described in the keywords (~x86) paragraphs, but it isn't complete. Reproducible: Always Steps to Reproduce: 1. 2. 3.
there's no point in mentioning -* really since it really doesnt do anything KEYWORDS="-* x86" is the samething as KEYWORDS="x86"
emerge man page has about a 10 line section on KEYWORDS already.