MediaWiki:Common.js

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jQuery(document).ready(function ($) {
    $('#wpTextbox1').wikiEditor('addToToolbar', {
        section: 'advanced',
        group: 'format',
        tools: {
            buttonId: {
                label: 'Comment visible only for editors',
                type: 'button',
                icon: '//upload.wikimedia.org/wikipedia/commons/f/f9/Toolbaricon_regular_S_stroke.png',
                action: {
                    type: 'encapsulate',
                    options: {
                        pre: "<!-- ",
                        peri: "Insert comment here",
                        post: " -->"
                    }
                }
            }
        }
    });
});