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-rw-r--r--Documentation/admin-guide/mm/userfaultfd.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/admin-guide/mm/userfaultfd.rst b/Documentation/admin-guide/mm/userfaultfd.rst
index 203e26da5f92..e5cc8848dcb3 100644
--- a/Documentation/admin-guide/mm/userfaultfd.rst
+++ b/Documentation/admin-guide/mm/userfaultfd.rst
@@ -113,6 +113,9 @@ events, except page fault notifications, may be generated:
areas. ``UFFD_FEATURE_MINOR_SHMEM`` is the analogous feature indicating
support for shmem virtual memory areas.
+- ``UFFD_FEATURE_MOVE`` indicates that the kernel supports moving an
+ existing page contents from userspace.
+
The userland application should set the feature flags it intends to use
when invoking the ``UFFDIO_API`` ioctl, to request that those features be
enabled if supported.