Update README

Author: meck

README.md

@@ -493,7 +493,7 @@ The terminals on which each has been confirmed to work are listed below.
 ### Unsupported environments
 
 - Sixel graphics is not supported.
-- Terminal multiplexers (screen, tmux, Zellij, etc.) are not supported.
+- Tmux is supported when using the Terminal graphics protocol (kitty, Ghosty), Other terminal multiplexers (screen, Zellij, etc.) are not supported.
 
 ## Contributing