let's bring back petter bergen our cnn goble analyst. what does it mean that it's plenling its allegiance boko haram to isis? >> it might be a medium deal right now. it's not like there are a lot of nigerians fight in syria. right now as arwa indicated, boko haram is under some pressure from the various you countries attacking it nigeria, chad and other countries. the timing is interesting. they're not doing so well. this is way to say we're with the biggest baddest terrorist group in the world. so it's worryisome. 18 others say hey, we support isis. it's not alone. >> what's the difference kb