diff --git a/Documentation/hwmon/htu31.rst b/Documentation/hwmon/htu31.rst
index ccde84264643..9ab774dcf65d 100644
--- a/Documentation/hwmon/htu31.rst
+++ b/Documentation/hwmon/htu31.rst
@@ -35,3 +35,10 @@ temp1_input:        temperature input
 humidity1_input:    humidity input
 heater_enable:      heater control
 =================== =================
+
+debugfs-Interface
+-----------------
+
+=================== =========================================
+serial_number:      unique serial number of the sensor
+=================== =========================================