diff --git a/Documentation/devicetree/bindings/iio/humidity/st,hts221.yaml b/Documentation/devicetree/bindings/iio/humidity/st,hts221.yaml
index 396451c26728273376a9d92e0662d01e1edf4a95..598473df74fa8013c186068b7b5c2da25360bc78 100644
--- a/Documentation/devicetree/bindings/iio/humidity/st,hts221.yaml
+++ b/Documentation/devicetree/bindings/iio/humidity/st,hts221.yaml
@@ -26,6 +26,8 @@ properties:
       The interrupt/data ready line will be configured as open drain, which
       is useful if several sensors share the same interrupt line.
 
+  vdd-supply: true
+
   interrupts:
     maxItems: 1