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Source:
p. 16, b. 494-523
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Prezentacja
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In the main text we add a cautionary 
before f
2. In analogous b. 493 the accidental is present in A and all the remaining sources. Moreover, Chopin probably hesitated in that respect, since the crossing-out visible there probably concerns the before that note, which means that it must have been entered twice.
See b. 494-496
Compare the passage in the sources»
category imprint: Differences between sources; Editorial revisions; Source & stylistic information
issues: Chopin's hesitations, GE revisions, Cautionary accidentals, Deletions in A
notation: Pitch
Missing markers on sources:
FE1, FED, FES, FESf, GE1, GE2, GE3, EE1, EE2, EE3, A, FC