diff --git a/components/sensor/sgp40.rst b/components/sensor/sgp40.rst
index 8ea7f92cc..cce91ab02 100644
--- a/components/sensor/sgp40.rst
+++ b/components/sensor/sgp40.rst
@@ -9,6 +9,14 @@ The ``sgp40`` sensor platform allows you to use your Sensirion SGP40 VOC sensor
 (`datasheet <https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/9_Gas_Sensors/Sensirion_Gas_Sensors_SGP40_Datasheet.pdf>`__) with ESPHome.
 The :ref:`I²C Bus <i2c>` is required to be set up in your configuration for this sensor to work.
 
+.. note::
+
+    This sensor need to be driven at a rate of 1Hz. Because of this, the
+    sensor will be read out on device once a second separately from the
+    update_interval.  The state will be reported to other components, or
+    the front end at the update_interval, saving wifi power and network
+    communication.
+
 .. figure:: images/sgp40.jpg
     :align: center
     :width: 80.0%