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Source:
p. 7, b. 75-80
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The cautionary 
before f3 was added in GE (→FE→EE). It seems to be highly unlikely that such a minor addition was performed by Chopin himself, but it cannot be excluded – cf. the note on d
3.
Compare the passage in the sources»
category imprint: Differences between sources
issues: GE revisions, Cautionary accidentals
notation: Pitch
Missing markers on sources:
A, Morch, FE1, FE2, FED, FEJ, FES, GE1, GE1a, GE2, EE1, EE2, EE3