Signed-off-by: Nguyễn Thái Ngọc Duy <>
 Oops, bogus indentation in the first 3/2

 Documentation/git-update-index.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-update-index.txt 
index 77a912d..dbb75f4 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -145,7 +145,14 @@ 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 in 1.8.0
+in October 2012). Other Git implementations may not support it yet.
        Only meaningful with `--stdin` or `--index-info`; paths are

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