Tmux is using C-b by default.

Thanks for noticing Fidel Barrera Cruz!
12 years ago · 587bc939f6
--- a/+ 1
+++ b/+ 1
@ -26,7 +26,7 @@ st or st-256color. The default value for TERM can be changed in config.h

 Using a terminal multiplexer.

 * `st -e tmux` using C-a [
 * `st -e tmux` using C-b [
 * `st -e screen` using C-a ESC

 ## Why doesn't the Del key work in some programs?