How to know which ACL triggered an Access Denied?

[Dayo <roneyworld@xxxxxxxxxxxxxx>]

Hi

I've got a bunch of ACLs that block sites based on various criteria. 
Sometimes I get an Access Denied that I can't match to any of my ACLs 
just by looking at the URL. How do I get squid to tell me which ACL 
triggered it?

Thanks

Dayo