Add link to related code

src/main.rs

@@ -405,6 +405,7 @@ fn draw_clippy_rect<T: std::io::Write>(c: ClippyRectangle, f: &mut Frame<Termion
     f.render_widget(help_message, area);
 }
 
+// Based on https://stackoverflow.com/a/65266882
 fn fmt_scientific(i: usize, f: f64, precision: usize) -> String {
     let mut ret = format!("{:.precision$e}", f, precision = precision);
     let exp = ret.split_off(ret.find('e').unwrap_or(0));