Yes, you do, as I believe Apple said this about that 18 months ago...
"Upcoming changes to app information fields
Starting in April, you’ll only be able to edit your app’s support URL, marketing URL, and “What’s New in This Version” text when submitting a new version of your app."
See ASC Help: Required, localizable, and editable properties
Thank you for your response. I'm new to iOS app development and all of its nuances.
Not sure any of us is up on them all, but if you can handle multitudinous nuance in a fluid and oft blackbox-style implementation, you'll be fine