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[PATCH v3 1/2] range-diff doc: add a section about output stability

The range-diff command is already advertised as porcelain, but let's
make it really clear that the output is completely subject to change,
particularly when it comes to diff options such as --stat. Right now
that option doesn't work, but fixing that is the subject of a later

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
 Documentation/git-range-diff.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/git-range-diff.txt b/Documentation/git-range-diff.txt
index f693930fdb..bbd07a9be8 100644
--- a/Documentation/git-range-diff.txt
+++ b/Documentation/git-range-diff.txt
@@ -78,6 +78,23 @@ between patches", i.e. to compare the author, commit message and diff of
 corresponding old/new commits. There is currently no means to tweak the
 diff options passed to `git log` when generating those patches.
+The output of the `range-diff` command is subject to change. It is
+intended to be human-readable porcelain output, not something that can
+be used across versions of Git to get a textually stable `range-diff`
+(as opposed to something like the `--stable` option to
+linkgit:git-patch-id[1]). There's also no equivalent of
+linkgit:git-apply[1] for `range-diff`, the output is not intended to
+be machine-readable.
+This is particularly true when passing in diff options. Currently some
+options like `--stat` can as an emergent effect produce output that's
+quite useless in the context of `range-diff`. Future versions of
+`range-diff` may learn to interpret such options in a manner specifc
+to `range-diff` (e.g. for `--stat` summarizing how the diffstat