diff --git a/app/README.txt b/app/README.txt
index 92a363bee..77550f1e5 100755
--- a/app/README.txt
+++ b/app/README.txt
@@ -78,4 +78,13 @@ Don't forget to change the email, password and authentication key after installa
 
 Recommended patches
 -------------------
-By default CakePHP exposes his name and version in email headers. Apply a patch to remove this behavior.
\ No newline at end of file
+By default CakePHP exposes his name and version in email headers. Apply a patch to remove this behavior.
+
+Multiple instances on a single server
+-------------------------------------
+If you want to install multiple instances on a single server, extract the CakePHP sources 
+in a central location like /opt/cakephp.
+ 
+Then edit /var/www/cydefsig/app/webroot/index.php and change :
+	define('CAKE_CORE_INCLUDE_PATH', '/opt/cakephp/lib');
+