Most of the GNU Emacs text editor is written in the programming
language called Emacs Lisp. You can write new code in Emacs Lisp and
install it as an extension to the editor. However, Emacs Lisp is more
-than a mere ``extension language''; it is a full computer programming
+than a mere extension language; it is a full computer programming
language in its own right. You can use it as you would any other
programming language.