Hyphen char after shebang notation

Hi,

I have a trivial question to ask, I am seeing in some shell scripts the '-' (hyphen) character following the first line of shell script (i.e) the shebang notation as follows:

#!/bin/sh -
#! /bin/bash -

what does the hyphen signify? What will happen if it is not given explicitly?

This could be helpful.

In addition you could read this article written by Perderabo,
Part 3 -- SUID Shell Scripts explains the meaning of the dash after the interpreter name.