unicorn process exceeding memory limit ...

I'm seeing this in my unicorn_stderr.log: (repeatedly)

W, [2014-08-27T13:36:35.548940 #27560] WARN -- : #Unicorn::HttpServer:0x00000001ae6ae0: worker (pid: 27560) exceeds memory limit (246919168 bytes > 222289655 bytes)

I'm using omnibus 7.1 on Centos 6.5

REQUEST: Make the unicorn memory limit a configurable value in /etc/gitlab/gitlab.rb