diff --git a/conf.org b/conf.org
index 1c1df1b..64a3adb 100644
--- a/conf.org
+++ b/conf.org
@@ -199,6 +199,8 @@ There are two things you can do about this warning:
 ** Cmake build and run
    #+BEGIN_SRC emacs-lisp
 
+(defvar cmake-last-target nil)
+
 (defun cmake-build-and-run ()
   "Asks for cmake target, then compiles and runs it."
   (interactive)
@@ -217,6 +219,7 @@ There are two things you can do about this warning:
 (define-key c-mode-base-map (kbd "C-c C-r") (function cmake-build-and-run))
 (define-key c-mode-base-map [f5] 'cmake-build-last-target)
    #+END_SRC
+
 ** Kód indentálás
    #+BEGIN_SRC emacs-lisp
     (defun indent-buffer ()