diff --git a/Documentation/devicetree/bindings/mailbox/fsl,mu.txt b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
index 9c43357c5924..31486c9f6443 100644
--- a/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
+++ b/Documentation/devicetree/bindings/mailbox/fsl,mu.txt
@@ -23,6 +23,8 @@ Required properties:
 		be included together with SoC specific compatible.
 		There is a version 1.0 MU on imx7ulp, use "fsl,imx7ulp-mu"
 		compatible to support it.
+		To communicate with i.MX8 SCU, "fsl,imx8-mu-scu" could be
+		used for fast IPC
 - reg :		Should contain the registers location and length
 - interrupts :	Interrupt number. The interrupt specifier format depends
 		on the interrupt controller parent.