diff --git a/buildout/README-2.12.txt b/buildout/README-2.12.txt
index 44bc511e9650a062fa75dd132e89a015d5a128b6..cebe6a992e30ef52d639ce925295b904f724825f 100644
--- a/buildout/README-2.12.txt
+++ b/buildout/README-2.12.txt
@@ -37,7 +37,7 @@ For example:
 Run the Zope 2.12 buildout:
 
   $ cd ~/erp5.buildout
-  $ python2.6 bootstrap/bootstrap.py -v 1.4.3
+  $ python2.6 -S bootstrap/bootstrap.py -v 1.4.3
   $ bin/buildout -v -c buildout-2.12.cfg
 
 This will download and install the software components needed to run ERP5 on