diff --git a/README.rdoc b/README.rdoc
index 4b8ecadf6..4ed2dbc25 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -17,7 +17,8 @@ want to answer them with a team of agents? You're going to love Zammad!
 
 2. Install all dependencies
      shell> cd zammad
-     shell> bundle install
+     shell> sudo - gem install bundler # (only if bundler is not installed)
+     shell> sudo - bundle install
 
 3. Configure your databases (if needed)