diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
index fdb8fb29033f95a736761828c746b7b4ad64a9ad..0bbb5d47f228832eb0a19fe407a0be949067768a 100644
--- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
+++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
@@ -97,6 +97,9 @@ Required properties:
     first port should be the input endpoint. The second should be the
     output, usually to an HDMI connector.
 
+Optional properties:
+  - hvcc-supply: the VCC power supply of the controller
+
 DWC HDMI PHY
 ------------