sugarcrm - Set Warnings To Be Displayed Globally In SugarCRM

Question

I want to set a message/warning which will be seen globally. How can I do this in an upgrade-safe manner? Right now I have implemented it as such:

/modules/Administration/DisplayWarnings.php

if(!empty($GLOBALS['sugar_config']['contact_name'])) {
    displayAdminError("My notification message goes here...");
}