diff --git a/doc/compile.org b/doc/compile.org
index 79d66b0..01a1e94 100644
--- a/doc/compile.org
+++ b/doc/compile.org
@@ -14,6 +14,7 @@ Install ~build-essential~
 #+end_example
 
 Download emacs (tarball) and open the directory
+https://www.gnu.org/software/emacs/
 
 #+begin_example sh
   ./autogen.sh