[PATCH] Documentation, git submodule: Note about --reference

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Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---

 Is it too obvious?
 I was approached off list and this was only obvious after some discussion,
 so I think it is a valid warning.
 
 On the other hand this might show that we want to get worktree working with
 submodules.

 Documentation/git-submodule.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
index bf3bb37..dcbd460 100644
--- a/Documentation/git-submodule.txt
+++ b/Documentation/git-submodule.txt
@@ -373,6 +373,10 @@ the submodule itself.
 +
 *NOTE*: Do *not* use this option unless you have read the note
 for linkgit:git-clone[1]'s `--reference` and `--shared` options carefully.
++
+*NOTE*: This gives the same reference to all submodules, so it is only useful
+if you are tracking different versions of a project in submodules instead
+of different projects.
 
 --recursive::
 	This option is only valid for foreach, update, status and sync commands.
-- 
2.9.2.800.g213104a

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