diff --git a/source/_docs/configuration/templating.markdown b/source/_docs/configuration/templating.markdown
index 4f75749683a5..931a30d70083 100644
--- a/source/_docs/configuration/templating.markdown
+++ b/source/_docs/configuration/templating.markdown
@@ -1636,11 +1636,13 @@ Example value template:
 With given payload:
 
 ```json
-{ "state": "ON", "temperature": 21.902 }
+{ "state": "ON", "temperature": 21.902, "humidity": null }
 ```
 
 Template {% raw %}`{{ value_json.temperature | round(1) }}`{% endraw %} renders to `21.9`.
 
+Template {% raw %}`{{ value_json.humidity }}`{% endraw %} renders to `None`.
+
 {% endnote %}
 
 #### Using command templates with MQTT
diff --git a/source/_integrations/sensor.mqtt.markdown b/source/_integrations/sensor.mqtt.markdown
index 1cf23ea7a427..e2d4639f77d9 100644
--- a/source/_integrations/sensor.mqtt.markdown
+++ b/source/_integrations/sensor.mqtt.markdown
@@ -201,7 +201,7 @@ state_class:
   required: false
   type: string
 state_topic:
-  description: The MQTT topic subscribed to receive sensor values. If `device_class`, `state_class`, `unit_of_measurement` or `suggested_display_precision` is set, and a numeric value is expected, an empty value `''` will be ignored and will not update the state, a `'null'` value will set the sensor to an `unknown` state. The `device_class` can be `null`.
+  description: The MQTT topic subscribed to receive sensor values. If `device_class`, `state_class`, `unit_of_measurement` or `suggested_display_precision` is set, and a numeric value is expected, an empty value `''` will be ignored and will not update the state, a `'None'` value will set the sensor to an `unknown` state. If a `value_template` is used to parse a JSON payload, a `null` value in the JSON [will be rendered as]((/docs/configuration/templating/#using-value-templates-with-mqtt)) `'None'`. Note that the `device_class` can be `null`.
   required: true
   type: string
 unique_id: