diff --git a/Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt b/Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt
index 5fa915a4b7360..ac54b5b9a045c 100644
--- a/Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt
+++ b/Documentation/devicetree/bindings/remoteproc/stm32-rproc.txt
@@ -21,6 +21,9 @@ Required properties:
 
 Optional properties:
 - interrupts:	Should contain the watchdog interrupt
+- wakeup-source: Flag indicating whether remoteproc can wake up the system by
+		the watchdog interrupt. Only meaningful if the "interrupts"
+		property is defined.
 - mboxes:	This property is required only if the rpmsg/virtio functionality
 		is used. List of phandle and mailbox channel specifiers:
 		- a channel (a) used to communicate through virtqueues with the