This is already documented by referencing git-diff-tree a few lines
above:
The command takes options applicable to the git-diff-tree[1]
command to control how the changes the commit introduces are
shown.
The man page of git-diff-tree talks about -p, and a lot more options.
Side note: -p is the default for git-show (of commits). Nevertheless, it
makes sense to specify it in combination with other options:
git show -p --stat
will show both the patch and the statistics.
-- Hannes
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