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-rw-r--r--Documentation/core-api/xarray.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/core-api/xarray.rst b/Documentation/core-api/xarray.rst
index 4b101b4f3aa1..2b397da84bcd 100644
--- a/Documentation/core-api/xarray.rst
+++ b/Documentation/core-api/xarray.rst
@@ -293,6 +293,12 @@ to :c:func:`xas_retry`, and retry the operation if it returns ``true``.
of this RCU period. You should restart the lookup from the head
of the array.
+ * - Zero
+ - :c:func:`xa_is_zero`
+ - Zero entries appear as ``NULL`` through the Normal API, but occupy
+ an entry in the XArray which can be used to reserve the index for
+ future use.
+
Other internal entries may be added in the future. As far as possible, they
will be handled by :c:func:`xas_retry`.