diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
index ac4cd0d6195a..dab51612eb8f 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
@@ -36,6 +36,8 @@ Optional properties:
   - usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
   - usb3-lpm-capable: determines if platform is USB3 LPM capable
   - quirk-broken-port-ped: set if the controller has broken port disable mechanism
+  - xhci-slow-suspend: set if it needs an extraordinary delay to wait
+    for xHC enter the Halted state after the Run/Stop (R/S) bit is cleared to '0'
   - imod-interval-ns: default interrupt moderation interval is 5000ns
   - phys : see usb-hcd.txt in the current directory