diff --git a/nixos/doc/manual/release-notes/rl-1903.xml b/nixos/doc/manual/release-notes/rl-1903.xml
index 18d32b59584..e58ce49c79b 100644
--- a/nixos/doc/manual/release-notes/rl-1903.xml
+++ b/nixos/doc/manual/release-notes/rl-1903.xml
@@ -666,6 +666,10 @@
Some OpenCL and VA-API applications might also break
(Beignet seems to provide OpenCL support with
modesetting driver, too).
+ Kernel mode setting API does not support backlight control,
+ so xbacklight tool will not work;
+ backlight level can be controlled directly via /sys/
+ or with brightnessctl.
Users who need this functionality more than multi-output XRandR are advised
to add `intel` to `videoDrivers` and report an issue (or provide additional
details in an existing one)