diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index 0083bd3..8d08bf0 100644
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -177,3 +177,7 @@
 the one of trip point N. The automatic control mode is less flexible
 than the manual control mode, but it reacts faster, is more robust and
 doesn't use CPU cycles.
+
+Trip points must be set properly before switching to automatic fan speed
+control mode. The driver will perform basic integrity checks before
+actually switching to automatic control mode.