It's not clear if RFC's is actually wrong or not... Reading discussion on it here:
http://english.stackexchange.com/questions/503/what-is-the-correct-way-to -pluralize-an-acronym
It's the s on the end of 'comments' that makes it ambiguous.
*NEVER* with apostrophes. We're English, man! :-) RFCs. APCs. TLDs. The apostrophes on plurals are an abomination ;-) Stefan Paetow Moonshot Industry & Research Liaison Coordinator t: +44 (0)1235 822 125 gpg: 0x3FCE5142 xmpp: stefanp@jabber.dev.ja.net skype: stefan.paetow.janet jisc.ac.uk Jisc is a registered charity (number 1149740) and a company limited by guarantee which is registered in England under Company No. 5747339, VAT No. GB 197 0632 86. Jisc¹s registered office is: One Castlepark, Tower Hill, Bristol, BS2 0JA. T 0203 697 5800. Jisc Collections and Janet Ltd. is a wholly owned Jisc subsidiary and a company limited by guarantee which is registered in England under Company No. number 2881024, VAT No. GB 197 0632 86. The registered office is: Lumen House, Library Avenue, Harwell, Didcot, Oxfordshire, OX11 0SG. T 01235 822200.