> diff --git a/drivers/mpool/mpool-locking.rst b/drivers/mpool/mpool-locking.rst
> new file mode 100644
> index 000000000000..6a5da727f2fb
> --- /dev/null
> +++ b/drivers/mpool/mpool-locking.rst
> @@ -0,0 +1,90 @@
> +Object Layout Reference Counts
> +------------------------------
> +
> +The reference counts for an object layout (eld_ref) are protected
> +by mmi_co_lock or mmi_uc_lock of the object's MDC dependiing upon
depending
> +which tree it is in at the time of acquisition.
--
~Randy
