Template:Link note
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This template can be used to create a "link note" which can be used to flag an external link for some reason, such as with {{registration required}}. It can add pages to a category to track such links as well. Note that this is an informational template rather than a cleanup tag: for issues which require cleanup, use {{fix}}.
Usage
[change source]{{link note|note=Registration required|cat=Pages containing links or citations to sites that require registration}}