diff --git a/bin/tat b/bin/tat
index 52f07b8cdb..01d6809729 100755
--- a/bin/tat
+++ b/bin/tat
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Attach to tmux session named the same as current directory.
+# Attach or create tmux session named the same as current directory.
 #
 
-tmux attach -t `basename $PWD`
+tmux new-session -As `basename $PWD`