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Intel Multi-byte NOP opcode made official

The latest version of IA-32 Intel Architecture Software Developers Manual Volume 2B: Instruction Set Reference, N-Z contains the opcode for a multi-byte NOP instruction. The opcode is
    0F 1F mod-000-rm
The multi-byte NOP can have any length up to 9 bytes. Quite useful for alignment. […]

Ugh, how do you track changes like this? Diffing those PDFs? Is there any ‘changelog’ for things like this?

ftp://download.intel.com/design/Pentium4/manuals/25366719.pdf
https://software.intel.com/en-us/forums/watercooler-catchall/topic/307174

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