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-rw-r--r--Documentation/git-update-index.txt5
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diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index 6b930bc163..1d9d81a702 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -323,6 +323,11 @@ from symbolic link to regular file.
The command looks at `core.ignorestat` configuration variable. See
'Using "assume unchanged" bit' section above.
+The command also looks at `core.trustctime` configuration variable.
+It can be useful when the inode change time is regularly modified by
+something outside Git (file system crawlers and backup systems use
+ctime for marking files processed) (see linkgit:git-config[1]).
+
SEE ALSO
--------