Explain yellow out-of-date button that sounds scary when read without context.

README.md

@@ -16,13 +16,13 @@
 ### Code status
-* [![build status](http://ci.gitlab.org/projects/1/status.png?ref=master)](http://ci.gitlab.org/projects/1?ref=master) ci.gitlab.org (master branch)
-* [![build status](https://secure.travis-ci.org/gitlabhq/gitlabhq.png)](https://travis-ci.org/gitlabhq/gitlabhq) travis-ci.org (master branch)
+* [![build status](http://ci.gitlab.org/projects/1/status.png?ref=master)](http://ci.gitlab.org/projects/1?ref=master) on ci.gitlab.org (master branch)
+* [![build status](https://secure.travis-ci.org/gitlabhq/gitlabhq.png)](https://travis-ci.org/gitlabhq/gitlabhq) on travis-ci.org (master branch)
 * [![Code Climate](https://codeclimate.com/github/gitlabhq/gitlabhq.png)](https://codeclimate.com/github/gitlabhq/gitlabhq)
-* [![Dependency Status](https://gemnasium.com/gitlabhq/gitlabhq.png)](https://gemnasium.com/gitlabhq/gitlabhq)
+* [![Dependency Status](https://gemnasium.com/gitlabhq/gitlabhq.png)](https://gemnasium.com/gitlabhq/gitlabhq) this button can be yellow (small updates are available) but must not be red (a security fix or an important update is available)
 * [![Coverage Status](https://coveralls.io/repos/gitlabhq/gitlabhq/badge.png?branch=master)](https://coveralls.io/r/gitlabhq/gitlabhq)