How to find the reason for a revocation

[Nicolas Rachinsky]

Hallo,

when I revoke a signature on an uid, gpg asks for the reason and a
description.

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Please select the reason for the revocation:
  0 = No reason specified
  4 = User ID is no longer valid
  Q = Cancel
(Probably you want to select 4 here)
Your decision? 4
Enter an optional description; end it with an empty line:
> 
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How can I view that information later?

Nicolas