To my knowledge, this has always been a shortcoming with logs. It shows a log entry with the ACL name, but not the line number it matched. Send cisco an enhancement request. maybe they will finally add this. I have asked for it before.

In order to add remarks to a rule, you must make to lines. First line is the remark and second line is the rule, like this:access-list acl_inbound line 3 remark *Following line allows me to ping server1*access-list acl_inbound line 4 permit icmp host...