Why Do Some U.S. Bills Have a Star at the End of the Serial Number?

https://money.howstuffworks.com/why-do-some-us-bills-have-a-star-instead-of-a-letter-at-the-end-of-the-serial-number.htm
Narrative

Some US currency have a star a the end of the serial number because they were reissued to correct a manufacturing error.