[The following paragraph was effective before December 31, 2016. See  PCAOB Release No. 2015-002. The current standard can be found  here.]

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The practitioner has no responsibility to keep informed of events subsequent to the date of his or her report; however, the practitioner may later become aware of conditions that existed at that date that might have affected the practitioner's report had he or she been aware of them. In such circumstances, the practitioner may wish to consider the guidance in AU section 561,Subsequent Discovery of Facts Existing at the Date of the Auditor's Report.