Update README.md

Author: petenorth

README.md

@@ -59,7 +59,7 @@ To address this I have created a separate nodejs 8 based Jenkins slave image pro
 
 https://github.com/petenorth/nodejs8-openshift-slave
 
-This slave image also includes Google Chrome which allows the ng test CLI goal (which requires Google Chrome) to be run. The resulting image is available in docker hub
+This slave image also includes Google Chrome which allows the ng test CLI goal (which requires Google Chrome) to be run. The resulting image is available in docker hub (the image is a bit big, feel free to create a custom image leaving out Google Chrome but note that the `ng test` step will need to be removed as well)
 
 https://hub.docker.com/r/petenorth/nodejs8-openshift-slave/