diff --git a/.config/fish/config.fish b/.config/fish/config.fish
index 33365c9..b17181d 100644
--- a/.config/fish/config.fish
+++ b/.config/fish/config.fish
@@ -62,3 +62,8 @@ end
 
 # Starship Prompt
 starship init fish | source
+
+if status is-interactive
+and not set -q TMUX
+    tmux new-session
+end
diff --git a/.config/kitty/kitty.conf b/.config/kitty/kitty.conf
index 30cb425..39484c2 100644
--- a/.config/kitty/kitty.conf
+++ b/.config/kitty/kitty.conf
@@ -761,7 +761,7 @@ mark3_background #f274bc
 
 #: Advanced {{{
 
-shell tmux
+shell fish
 
 #: The shell program to execute. The default value of . means to use
 #: whatever shell is set as the default shell for the current user.
diff --git a/README.org b/README.org
index 9bdd654..e2b49f1 100644
--- a/README.org
+++ b/README.org
@@ -5330,6 +5330,15 @@ fish_pager_color_secondary_completion f8f8f2
 fish_pager_color_secondary_description 6272a4
 #+END_SRC
 
+**** Start Tmux
+
+#+BEGIN_SRC fish :tangle .config/fish/config.fish
+if status is-interactive
+and not set -q TMUX
+    tmux new-session
+end
+#+END_SRC
+
 ** Terminal
 
 *** Kitty
@@ -6136,7 +6145,7 @@ mark3_background #f274bc
 #+BEGIN_SRC conf :tangle .config/kitty/kitty.conf
 #: Advanced {{{
 
-shell tmux
+shell fish
 
 #: The shell program to execute. The default value of . means to use
 #: whatever shell is set as the default shell for the current user.