diff --git a/doc/source/user/spark-plugin.rst b/doc/source/user/spark-plugin.rst
index df7c477..5d906b3 100644
--- a/doc/source/user/spark-plugin.rst
+++ b/doc/source/user/spark-plugin.rst
@@ -22,9 +22,8 @@ CDH 5.4.0 HDFS and Apache Spark installed.
 The Spark plugin requires an image to be tagged in the sahara image registry
 with two tags: 'spark' and '<Spark version>' (e.g. '1.6.0').
 
-Also you should specify the username of the default cloud-user used in the
-image. For the images available at the URLs listed above and for all the ones
-generated with the DIB it is `ubuntu`.
+The image requires a username. For more information, refer to the
+:doc:`registering-image` section.
 
 Note that the Spark cluster is deployed using the scripts available in the
 Spark distribution, which allow the user to start all services (master and