Tracking Admin Logins

How can I track when people login into the admin web page? I tried selecting Notice and then Info level in the System Log - General Log page, but it does not seem to pick up Admin logins & outs.

Do i need to set it to debug level? (That seems a bit extreme.)

It appears in my system log:

Thu Aug 9 23:58:37 2018 daemon.err uhttpd[3066]: luci: accepted login on / for root from

Works for me by default on 18.06.0.