[plt-scheme] dumb question

Hi,

(module x mzscheme
 (provide (all-from-except mzscheme add1))
 (add1 1))

and

(module x scheme
 (add1 1))

Work ok, but:

(module x scheme
 (provide (except-out scheme add1))
 (add1 1))

Gives:

except-out: identifier to remove `add1' not included in nested provide spec in: scheme

How come? Am I overlooking some parts of the docs?
Thanks, Jos
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