Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
.. and the user should know (briefly) the differences between index
versions too.
Documentation/git-update-index.txt | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/Documentation/git-update-index.txt
b/Documentation/git-update-index.txt
index 77a912d..e5aaba5 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -145,7 +145,15 @@ you will need to handle the situation manually.
--index-version <n>::
Write the resulting index out in the named on-disk format version.
- The current default version is 2.
+ Supported versions are 2, 3 and 4. The current default version is 2
+ or 3, depending on whether extra features are used, such as
+ `git add -N`.
++
+ Version 4 performs a simple pathname compression that could
+ reduce index size by 30%-50% on large repositories, which
+ results in faster load time. Version 4 is relatively young
+ (first released in 1.8.0 in October 2012). Other Git
+ implementations may not support it yet.
-z::
Only meaningful with `--stdin` or `--index-info`; paths are
--
1.8.1.2.536.gf441e6d
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