Translations:Help:VisualEditor/User guide/Citation templates/29/en

Ideally, every sentence or paragraph in an article should be supported by a citation, in a footnote. If you have some text that needs a citation (source) to support it, and the page already has a footnote that applies to (supports) that text, then you can re-use the existing citation, because one footnote can support multiple, different sentences or paragraphs.