FSL_HELO_BARE_IP_2 rule?

[Thomas Harold]

Not documented on the wiki:
http://wiki.apache.org/spamassassin/Rules/FSL_HELO_BARE_IP_2

FSL_HELO_BARE_IP_1 is documented as:
X-Spam-Relays-External =~ /^[^\]]+ helo=\d+\.\d+\.\d+\.\d+ /i   

Anyone know what the goal of FSL_HELO_BARE_IP_2 is?