diff --git a/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml b/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml
index 5454d9403cad..12e738b1270a 100644
--- a/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml
+++ b/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml
@@ -16,6 +16,7 @@ description:
 properties:
   compatible:
     enum:
+      - qnap,ts133-mcu
       - qnap,ts233-mcu
       - qnap,ts433-mcu