diff --git a/free-programming-books.md b/free-programming-books.md
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@@ -453,6 +453,7 @@
 ###Emacs
 * [GNU Emacs Manual, 17th Edition, v. 24.2](http://shop.fsf.org/product/Emacs_Manual_24/)
 * [An Introduction to Programming in Emacs Lisp, 3rd Edition](https://www.gnu.org/software/emacs/manual/html_node/eintr/index.html)
+* [GNU Emacs Lisp Reference Manual](http://www.gnu.org/software/emacs/manual/elisp.html)
 
 
 ###Erlang