The extra dates will be announced later today.
The gigs will take place over consecutive nights this June.
Savages, Beach House, Deerhunter and Julia Holter are also set to perform.
The event takes place in Hungary next August.
Ho99o9 have also signed up to play.
Sigur Rós have been announced as a headliner for next summer’s Citadel Festival.
Featuring The Gospel Youth, Manchester Orchestra, Creeper, The Xcerts, Estrons, Sheer Mag, Fangclub, Waxahatchee and loads more.
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