What does it mean - %d...?

If I’ve got a single id value, then what does it mean if the following code uses three dots after %d?

fmt.Fprintf(w, "a book with id=%d...", id)
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They are just three dots. Try it:

package main

import (

func main() {
	id := 1
	fmt.Printf("a book with id=%d...", id)


a book with id=1…

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