diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 10f062e..8c745c89 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -364,6 +364,7 @@
 	accumulates error when temperature is above the desired
 	temperature trip point. For more information see
 	Documentation/thermal/power_allocator.txt
+	Unit: millidegree Celsius
 	RW, Optional
 
 slope