diff --git a/system/hardware/fan_controller.py b/system/hardware/fan_controller.py
index 1551029432..f326e7ee99 100755
--- a/system/hardware/fan_controller.py
+++ b/system/hardware/fan_controller.py
@@ -7,6 +7,8 @@ from openpilot.common.swaglog import cloudlog
 from openpilot.common.pid import PIDController
 from openpilot.system.hardware import HARDWARE
 
+# raise fan setpoint on tici/tizi to reduce noise
+# after raising LMH threshold in AGNOS 18.1 to prevent CPU throttling
 OFFSET = 0 if HARDWARE.get_device_type() == "mici" else 5
 
 class BaseFanController(ABC):