diff --git a/website/docs/building_ubuntu_9.04.html b/website/docs/building_ubuntu_9.04.html
index 151108a1..c60f29a6 100644
--- a/website/docs/building_ubuntu_9.04.html
+++ b/website/docs/building_ubuntu_9.04.html
@@ -33,6 +33,14 @@ li {
 $ git clone http://code.stapelberg.de/git/i3
 </pre>
 
+<p>
+  Now install the build-dependencies for i3 which are included in ubuntu:
+</p>
+
+<pre>
+$ sudo apt-get install libev-dev
+</pre>
+
 <p>
   The Ubuntu repositories do not contain the required versions of several packages. Hence we need
   to get them from Debian. Create a new directory for the .debs