diff --git a/Documentation/devicetree/bindings/input/fsl-mma8450.txt b/Documentation/devicetree/bindings/input/fsl-mma8450.txt
index a00c94ccbdee..0b96e5737d3a 100644
--- a/Documentation/devicetree/bindings/input/fsl-mma8450.txt
+++ b/Documentation/devicetree/bindings/input/fsl-mma8450.txt
@@ -2,6 +2,7 @@
 
 Required properties:
 - compatible : "fsl,mma8450".
+- reg: the I2C address of MMA8450
 
 Example: