Help adding atom to rss v2.0 feed

Hello everyone,Im a newbie at this stuff.I have a valid rss v2.0 feed but i=
t says its missing atom.Have no clue how to do this.Here is the feed. http:=
//groups.google.com/group/rec.games.pinball/feed/rss_v2_0_msgs.xml=A0If any=
one could show me what this feed should look like with the atom added i wou=
ld be greatfull.Thanks


=20=20=20=20=20=20

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