diff --git a/light.1 b/light.1
index e3481e7..fecd4de 100644
--- a/light.1
+++ b/light.1
@@ -38,6 +38,8 @@ List available devices
 Increase brightness by value
 .It Fl U
 Decrease brightness by value
+.It Fl T
+Multiply brightness by value (can be non-integer)
 .It Fl S
 Set brightness to value
 .It Fl G