diff --git a/home/user/.config/tmux/mappings.conf b/home/user/.config/tmux/mappings.conf
index ae706dc..745f5cd 100644
--- a/home/user/.config/tmux/mappings.conf
+++ b/home/user/.config/tmux/mappings.conf
@@ -17,6 +17,10 @@ bind -T off F12 \
     set status on
 
 
+# Choose session with key index starting from 1
+bind-key s choose-tree -ZsK '#{?#{e|<:#{line},9},#{e|+:1,#{line}},#{?#{e|<:#{line},35},M-#{a:#{e|+:97,#{e|-:#{line},9}}},}}'
+
+
 # Switch new named session
 bind n command-prompt -p "New session:" "new-session -A -d -s '%1' \; switch-client -t '%1'"