Is there some authority files about instruction `jmpi` [migrated]

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http://unix.stackexchange.com – I am learning how Linux works. I have encountered a strange assembly language instruction, jmpi. I can find some explanation at various websites, but strangely I can't find it in assembly language books, including the Intel® 64 and IA-32 Architectures Software Developer’s Manual. I have searched the book, but it doesn't contain the instruction jmpi. I think the Intel manual should be the the most authoritative book on Intel assembly language. So it is very strange. My question is: is there some book or authoritative files which document this instruction? (HowTos)