Soul Knives make attack rolls like normal weapons but damage is 1d8 psychic damage?

@MarkSparklFarklSoul Knives make attack rolls like normal weapons but damage is 1d8 (no modifier) psychic damage? I read your tweet too quickly and missed the "(no modifier)" part. Nothing in Soul Knife says you don't add your modifier.

— Jeremy Crawford (@JeremyECrawford) March 15, 2017