diff --git a/kittens/icat/main.py b/kittens/icat/main.py
index 430c06b13..b3ad4e885 100644
--- a/kittens/icat/main.py
+++ b/kittens/icat/main.py
@@ -42,7 +42,9 @@
 
 --clear
 type=bool-set
-Remove all images currently displayed on the screen.
+Remove all images currently displayed on the screen. Note that
+this cannot work with terminal multiplexers such as tmux since
+only the multiplexer can know the position of the screen.
 
 
 --transfer-mode