Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 Documentation/config.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 08f638c65c..8fbef25cb1 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2776,6 +2776,17 @@ splitIndex.maxPercentChange::
        than 20 percent of the total number of entries.
        See linkgit:git-update-index[1].
 
+splitIndex.sharedIndexExpire::
+       When the split index feature is used, shared index files with
+       a mtime older than this time will be removed when a new shared
+       index file is created. The value "now" expires all entries
+       immediately, and "never" suppresses expiration altogether.
+       The default value is "one.week.ago".
+       Note that each time a new split-index file is created, the
+       mtime of the related shared index file is updated to the
+       current time.
+       See linkgit:git-update-index[1].
+
 status.relativePaths::
        By default, linkgit:git-status[1] shows paths relative to the
        current directory. Setting this variable to `false` shows paths
-- 
2.11.0.49.g2414764.dirty

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