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diff --git a/docs/domain_support.md b/docs/domain_support.md
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+++ b/docs/domain_support.md
@@ -159,6 +159,13 @@ The DT properties of a domain instance DT node are as follows:
* **possible-harts** (Optional) - The list of CPU DT node phandles for the
the domain instance. This list represents the possible HARTs of the
domain instance.
+* **root-regions-inheritance** (Optional) - A string property controlling
+ how memory regions are inherited from **the ROOT domain**, which are then
+ overlaid with regions specified in the **regions** property for additional
+ restrictions. The allowed values are:
+ * "all" - inherit all memory regions from **the ROOT domain**
+ * "m-only" - inherit M-mode only memory regions from **the ROOT domain**
+ If this DT property is absent, behavior is the same as "m-only".
* **regions** (Optional) - The list of domain memory region DT node phandle
and access permissions for the domain instance. Each list entry is a pair
of DT node phandle and access permissions. The access permissions are