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-rw-r--r--Documentation/git-sparse-checkout.txt14
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diff --git a/Documentation/git-sparse-checkout.txt b/Documentation/git-sparse-checkout.txt
index a0eeaeb02e..fdcf43f87c 100644
--- a/Documentation/git-sparse-checkout.txt
+++ b/Documentation/git-sparse-checkout.txt
@@ -45,6 +45,20 @@ To avoid interfering with other worktrees, it first enables the
When `--cone` is provided, the `core.sparseCheckoutCone` setting is
also set, allowing for better performance with a limited set of
patterns (see 'CONE PATTERN SET' below).
++
+Use the `--[no-]sparse-index` option to toggle the use of the sparse
+index format. This reduces the size of the index to be more closely
+aligned with your sparse-checkout definition. This can have significant
+performance advantages for commands such as `git status` or `git add`.
+This feature is still experimental. Some commands might be slower with
+a sparse index until they are properly integrated with the feature.
++
+**WARNING:** Using a sparse index requires modifying the index in a way
+that is not completely understood by external tools. If you have trouble
+with this compatibility, then run `git sparse-checkout init --no-sparse-index`
+to rewrite your index to not be sparse. Older versions of Git will not
+understand the sparse directory entries index extension and may fail to
+interact with your repository until it is disabled.
'set'::
Write a set of patterns to the sparse-checkout file, as given as