diff --git a/motion.1 b/motion.1
index 65a8878a..e45de3bd 100644
--- a/motion.1
+++ b/motion.1
@@ -977,7 +977,7 @@ Description:
 .fi
 .RS
 Ignore sudden massive light intensity changes.
-Value is a percentage of the picture area that changed intensity.
+Triggers when the percentage of the picture area that changed intensity is greater than this value.
 .RE
 .RE