diff --git a/sh/tmux.sh b/sh/tmux.sh
index fbce852..eb7dbb7 100644
--- a/sh/tmux.sh
+++ b/sh/tmux.sh
@@ -49,9 +49,9 @@ set-option -g set-titles on
 set-option -g set-titles-string '\
 #{session_name}\
   /  \
-#{window_index} #{window_name}\
+#{window_index}∕#{session_windows} #{window_name}\
   /  \
-#{pane_index} #{pane_current_command}\
+#{pane_index}∕#{window_panes} #{pane_current_command}\
   (#{pane_width}×#{pane_height})\
 '