Question about the GPL v3

[Chris Travers]

Though this may be a typo, it seems incredibly unclear to me:

Section 5d:

d) If the work has interactive user interfaces, each must display 
Appropriate Legal Notices; however, if the Program has interactive 
interfaces that do not display Appropriate Legal Notices, your work need 
not make them do so.

Am I right that this amounts to:

"If the work has ineractive user interfaces, Appropriate Legal Notices 
may not be removed though they may be updated as appropriate?"

Here is my confusion.  THe first part says you must have these notices, 
but the second says that if you don't have these notices, you don't have to.

Am I missing something obvious in the bounds of the license?  Is there 
any basis for any interpretation in the license or outside?

Best Wishes,
Chris Travers
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