Certificate CRL

Hi

I’ve noticed that in /certificate menu it’s possible to add/define CRL. I’m not sure why it’s there, as certificates define CRL themselves: a certificate can contain CRL url for verification (alternative method is OCSP).

Ex: certificate of this forum site, defines a CRL and it’s enclosed in it, and defined as “http://e5.c.lencr.org/89.crl

Hence, why is it necessary to define CRL manually?