Mention another important benefit of Buildroot.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

docs/buildroot.html

@@ -108,6 +108,12 @@
     each <code>gcc</code> and <code>binutils</code> version to make them work
     on most architectures. </p>
 
+    <p>Moreover, Buildroot provides an infrastructure for reproducing
+    the build process of your embedded root filesystem. Being able to
+    reproduce the build process will be useful when a component needs
+    to be patched or updated, or when another person is supposed to
+    take over the project.</p>
+
     <h2><a name="download" id="download"></a>Obtaining Buildroot</h2>
 
     <p>Buildroot is available as daily SVN snapshots or directly using