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Yes, it's fine. I would set it off though. Italics might work. Or an indented blockquote style. Or a divider between that line and the rest of the story. You might also make it a fake quote. ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/42491 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42491 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/