Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 Documentation/config.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 8e745bda52..0e9982c5e3 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2844,6 +2844,18 @@ 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 that
+       were not modified since the time this variable specifies 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 "2.weeks.ago".
+       Note that a shared index file is considered modified (for the
+       purpose of expiration) each time a new split-index file is
+       created based on it.
+       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
-- 
2.12.0.22.g0672473d40

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