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-rw-r--r--Documentation/config/rebase.txt14
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diff --git a/Documentation/config/rebase.txt b/Documentation/config/rebase.txt
index 42e1ba7575..f079bf6b7e 100644
--- a/Documentation/config/rebase.txt
+++ b/Documentation/config/rebase.txt
@@ -1,3 +1,17 @@
+rebase.useBuiltin::
+ Set to `false` to use the legacy shellscript implementation of
+ linkgit:git-rebase[1]. Is `true` by default, which means use
+ the built-in rewrite of it in C.
++
+The C rewrite is first included with Git version 2.20. This option
+serves an an escape hatch to re-enable the legacy version in case any
+bugs are found in the rewrite. This option and the shellscript version
+of linkgit:git-rebase[1] will be removed in some future release.
++
+If you find some reason to set this option to `false` other than
+one-off testing you should report the behavior difference as a bug in
+git.
+
rebase.stat::
Whether to show a diffstat of what changed upstream since the last
rebase. False by default.