diff --git a/Documentation/devicetree/bindings/rng/st,stm32-rng.txt b/Documentation/devicetree/bindings/rng/st,stm32-rng.txt
index 47f04176f93bd81e9792fe30e6acdd36ccf7ab11..cb7ca78135ffe98774632016acfbee6209c80579 100644
--- a/Documentation/devicetree/bindings/rng/st,stm32-rng.txt
+++ b/Documentation/devicetree/bindings/rng/st,stm32-rng.txt
@@ -11,6 +11,9 @@ Required properties:
 - interrupts : The designated IRQ line for the RNG
 - clocks : The clock needed to enable the RNG
 
+Optional properties:
+- resets : The reset to properly start RNG
+
 Example:
 
 	rng: rng@50060800 {