+ "Toggle SGML Electric Tag Pair mode.
+With a prefix argument ARG, enable the mode if ARG is positive,
+and disable it otherwise. If called from Lisp, enable the mode
+if ARG is omitted or nil.
+
+SGML Electric Tag Pair mode is a buffer-local minor mode for use
+with `sgml-mode' and related major modes. When enabled, editing
+an opening markup tag automatically updates the closing tag."