/usr/share/irssi/help/roster is in irssi-plugin-xmpp 0.52+git20160118-1.
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1 2 3 4 5 6 7 8 9 | ROSTER [full]
ROSTER add <jid>
ROSTER remove <jid>
ROSTER name <jid> <name>
ROSTER group <jid> <group>
This command includes various subcommands for handling your contact list.
See also: PRESENCE
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