The 
indication was almost certainly added by Chopin to [FC] or in the process of proofreading FE1, hence we include it in the main text. The brackets result from uncertainty as to the relationship of this indication with 
in bar 43, as no other source features both. Chopin could have been aware of the absence of (or even removed it) and added instead. In this case, these indications should be considered separately, taking into account only one of them. On the other hand, he could have added simply to specify the dynamics in this place, regardless of the other markings or their absence, which would allow us to take into consideration both indications. Out of these three possibilities – only, only, both – the variant solution we adopted includes the ones with the indication written in the principal source (A).
See b. 43
Compare the passage in the sources»
category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FE
notation: Verbal indications