Expire of elgamal sub

[Faramir]

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Hello!

Laurent Jumet escribió:
...
>>  gpg -edit--key 7A5A6CC7 (press enter)
>>  key 1 (press enter -this will select the subkey to edit)
>>  expire (press enter -this will tell gpg you want to modify the
>> expiration date)
...
>     Special attention should be payd to V3 and V4 sigs, that implies keys expiration.

   I didn't fully understand that... What do we have to look for?

  Best Regards
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