diff --git a/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
index 55ab45f669ac..0da739d9a816 100644
--- a/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
+++ b/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
@@ -251,6 +251,13 @@ Description:	RO. Fan 2 speed in RPM.
 
 		Only supported for particular Intel Xe graphics platforms.
 
+		On DG2 the driver always shows two fan channels, because the
+		FSC_READ_NUM_FANS command does not work on some cards. OEMs
+		decide how the fans map to tach channels, so two fans can share
+		one tach line. When that happens, the second channel
+		reads 0 RPM even though the fan is spinning. This is normal, not
+		a bug.
+
 What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/fan3_input
 Date:		March 2025
 KernelVersion:	6.16