diff --git a/meta-arm-autonomy/documentation/xen-devicetree.md b/meta-arm-autonomy/documentation/xen-devicetree.md
index 0d4466a0..0b3f41bf 100644
--- a/meta-arm-autonomy/documentation/xen-devicetree.md
+++ b/meta-arm-autonomy/documentation/xen-devicetree.md
@@ -70,9 +70,10 @@ The following parameters are available:
   This variable is only used if XEN_DEVICETREE_XEN_BOOTARGS has a value
   containing "dom0_mem=${XEN_DEVICETREE_DOM0_MEM}" as the memory assigned to
   dom0 is defined using Xen boot arguments.
-  This variable is set by default to "1024M", and cannot be empty.
-  The value can also be of the form "1024M,max:1024M", as documented here:
-  https://wiki.xenproject.org/wiki/Do%EF%BB%BFm0_Memory_%E2%80%94_Where_It_Has_Not_Gone
+  This variable is set by default to "1024M,max:1024", and cannot be empty.
+  The value can simply specify a size, e.g. "1024M", but best practice is to
+  also provide a max, documented here:
+  https://wiki.xenproject.org/wiki/Xen_Project_Best_Practices
 
 - XEN_DEVICETREE_DOM0_BOOTARGS: Boot arguments to pass to Dom0 Linux when
   booting it.
diff --git a/meta-arm-autonomy/recipes-extended/xen-devicetree/xen-devicetree.bb b/meta-arm-autonomy/recipes-extended/xen-devicetree/xen-devicetree.bb
index c6a785f2..29b80231 100644
--- a/meta-arm-autonomy/recipes-extended/xen-devicetree/xen-devicetree.bb
+++ b/meta-arm-autonomy/recipes-extended/xen-devicetree/xen-devicetree.bb
@@ -19,7 +19,7 @@ DESCRIPTION = "Add entries in DTB for Xen and Dom0"
 XEN_DEVICETREE_DEPEND_append = " virtual/kernel:do_deploy"
 XEN_DEVICETREE_DTBS ?= "${KERNEL_DEVICETREE}"
 XEN_DEVICETREE_XEN_BOOTARGS ?= "noreboot dom0_mem=${XEN_DEVICETREE_DOM0_MEM}"
-XEN_DEVICETREE_DOM0_MEM ?= "1024M"
+XEN_DEVICETREE_DOM0_MEM ?= "1024M,max:1024M"
 XEN_DEVICETREE_DOM0_BOOTARGS ?= "console=hvc0 earlycon=xen"
 XEN_DEVICETREE_DOM0_ADDR ?= "0x80080000"
 XEN_DEVICETREE_DOM0_SIZE ?= "0x01000000"