diff --git a/migrations/1778752973.sh b/migrations/1778752973.sh
new file mode 100644
index 00000000..7604b0e4
--- /dev/null
+++ b/migrations/1778752973.sh
@@ -0,0 +1,28 @@
+echo "Add Alt+Enter smart split keybinding to tmux"
+
+tmux_config="$HOME/.config/tmux/tmux.conf"
+
+if [[ -f $tmux_config ]] && ! grep -q "bind -n M-Enter run-shell" "$tmux_config"; then
+  if grep -q '^bind ? display-popup .*omarchy-menu-tmux-keybindings' "$tmux_config"; then
+    sed -i '/^bind ? display-popup .*omarchy-menu-tmux-keybindings/a bind -n M-Enter run-shell \\
+"[[ $(tmux list-panes | wc -l) -eq 1 ]] \&\& \\
+tmux splitw -h -c '\''#{pane_current_path}'\'' || \\
+tmux splitw -v -c '\''#{pane_current_path}'\''"' "$tmux_config"
+  elif grep -q '^bind q source-file .*Configuration reloaded' "$tmux_config"; then
+    sed -i '/^bind q source-file .*Configuration reloaded/a bind -n M-Enter run-shell \\
+"[[ $(tmux list-panes | wc -l) -eq 1 ]] \&\& \\
+tmux splitw -h -c '\''#{pane_current_path}'\'' || \\
+tmux splitw -v -c '\''#{pane_current_path}'\''"' "$tmux_config"
+  else
+    cat >>"$tmux_config" <<'EOF'
+
+# Smart split: horizontal from one pane, vertical otherwise
+bind -n M-Enter run-shell \
+"[[ $(tmux list-panes | wc -l) -eq 1 ]] && \
+tmux splitw -h -c '#{pane_current_path}' || \
+tmux splitw -v -c '#{pane_current_path}'"
+EOF
+  fi
+
+  omarchy-restart-tmux
+fi