diff --git a/Customization.md b/Customization.md
index 6e4801a..e8ba048 100644
--- a/Customization.md
+++ b/Customization.md
@@ -8,6 +8,8 @@ The Steam Deck driver has an optional advanced mode which is activated when a va
 
 The structure and default values are defined in [oc_limits.rs](https://github.com/NGnius/PowerTools/blob/dev/backend/src/settings/steam_deck/oc_limits.rs). If you do not understand the [JSON sample](https://github.com/NGnius/PowerTools/blob/dev/pt_oc.json) as well as the [Rust declaration](https://github.com/NGnius/PowerTools/blob/dev/backend/src/settings/steam_deck/oc_limits.rs) you should not use this feature.
 
+NOTE: since some kernel interfaces only accept the default Steam Deck ranges, changing certain ranges is only a placebo in the UI. The log is your friend to find out when this is happening.
+
 ## battery
 
 The top-level `battery` object contains the custom configuration for the battery part of the Steam Deck driver. Presently, this only contains 1 field.