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How should I ideally modify an already existing syntax file without touching the file itself (since it's normally not world writeable)?

I want to add the keyword \autoref to TeX's syntax highlighting, so that it is recognized by vim as RefZone. Basically I need to extend the following line:

syn region texRefZone         matchgroup=texStatement start="\\\(page\|eq\)ref{"      end="}\|%stopzone\>"    contains=@texRefGroup
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    Start with Vim's help: :h mysyntaxfile-add.
    – VanLaser
    Oct 18 '15 at 17:24
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Create a file named *.vim in ~/.vim/after/syntax/ and add the desired modified line.

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