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-rw-r--r--Documentation/filesystems/erofs.rst2
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diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst
index 067fd1670b1f..a43aacf1494e 100644
--- a/Documentation/filesystems/erofs.rst
+++ b/Documentation/filesystems/erofs.rst
@@ -120,6 +120,8 @@ dax={always,never} Use direct access (no page cache). See
dax A legacy option which is an alias for ``dax=always``.
device=%s Specify a path to an extra device to be used together.
fsid=%s Specify a filesystem image ID for Fscache back-end.
+domain_id=%s Specify a domain ID in fscache mode so that different images
+ with the same blobs under a given domain ID can share storage.
=================== =========================================================
Sysfs Entries