diff --git a/source/_integrations/airgradient.markdown b/source/_integrations/airgradient.markdown
index b9ef23b466c..e387d231644 100644
--- a/source/_integrations/airgradient.markdown
+++ b/source/_integrations/airgradient.markdown
@@ -20,6 +20,12 @@ ha_zeroconf: true
 
 The Airgradient integration will fetch data from your [Airgradient devices](https://www.airgradient.com/).
 
+<div class='note'>
+
+In order for the device to be set up or discovered by Home Assistant, the firmware version should be at least 3.1.1.
+
+</div>
+
 {% include integrations/config_flow.md %}
 
 ## Available sensors