Update README.md

README.md

@@ -9,6 +9,13 @@ Download using HACS or manually put it in custom_components folder.
 The integration supports discovery of devices, so any fans should be automatically discovered.
 If not you may try to add it manually through the integration configuration.
 
+## Sensor data
+
+The sensors for temp/humidity/light seem to be a bit inaccurate, or I'm not converting them correctly, so don't expect them to be as accurate as from other dedicated sensors.
+Humidity sensor will show 0 when humidity is low!
+Air flow is just a conversion of the fan speed based on a linear correlation between those two. This is a bit inaccurate at best, as the true flow will vary greatly depending on how your fan is mounted.
+
+
 ## Good to know
 
 Speed and duration for boostmode are local variables in home assistant, and as such will not influence boostmode from the app. These variables will also be reset to default if you re-add a device.