diff --git a/docu/CONFIGURATION.md b/docu/CONFIGURATION.md
index 7370457..3c9214d 100644
--- a/docu/CONFIGURATION.md
+++ b/docu/CONFIGURATION.md
@@ -48,3 +48,5 @@ If the preparation is done, disable
 and then enable
 `Extra Functions > BME680 BSEC`.
 instead.
+
+**NOTE:** the BME680 is mounted inside the Thingy:91 and is therefore only weakly coupled to the environment. On battery charging, the temperature gets up to 30°. If you want more realisitc values, please remove the board from the case.