[PATCH] Document that using -M without other diff options is not a good idea

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Signed-off-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>
---

I just noticed that I used 'git log -M' in some scripts which is obviously bad.
People should not use that option without other diff options.

 Documentation/diff-options.txt |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index b1f528a..ed827f8 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -92,7 +92,9 @@
 	Break complete rewrite changes into pairs of delete and create.
 
 -M::
-	Detect renames.
+	Detect renames. It's no good using this option if you don't use diff
+	options like `--name-status`, `-p` or `--stat` as it will just slow
+	down the revision walker.
 
 -C::
 	Detect copies as well as renames.  See also `--find-copies-harder`.
-- 
1.5.3.5

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