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-rw-r--r--Documentation/git-submodule.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
index e5767134b1..2f18f7daf8 100644
--- a/Documentation/git-submodule.txt
+++ b/Documentation/git-submodule.txt
@@ -159,7 +159,9 @@ update::
This will make the submodules HEAD be detached unless `--rebase` or
`--merge` is specified or the key `submodule.$name.update` is set to
`rebase`, `merge` or `none`. `none` can be overridden by specifying
- `--checkout`.
+ `--checkout`. Setting the key `submodule.$name.update` to `!command`
+ will cause `command` to be run. `command` can be any arbitrary shell
+ command that takes a single argument, namely the sha1 to update to.
+
If the submodule is not yet initialized, and you just want to use the
setting as stored in .gitmodules, you can automatically initialize the