node-red/packages/node_modules/@node-red/nodes/locales/en-US/common/90-comment.html

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<script type="text/html" data-help-name="comment">
    <p>A node you can use to add comments to your flows.</p>
    <h3>Details</h3>
    <p>The edit panel will accept Markdown syntax. The text will be rendered into
    this information side panel.</p>
</script>