sed --debug option unrecognized on 4.5

[Mark Kim-Mulgrew]

Hi all,

I am new to sed and am going through the manual:
https://www.gnu.org/software/sed/manual/sed.html

One of the first examples in the manual is

$ echo 1 | sed --debug '\%1%s21232'

But when I type it in, I get the error message

sed: unrecognized option '--debug'

Is the debug option not present in older versions of sed?

Thank you,
Mark