Add comments for composite constructs
Add comments for composite constructs

guoyiteng/braid,guoyiteng/braid,cucapra/braid,cucapra/braid,guoyiteng/braid,cucapra/braid,cucapra/braid,guoyiteng/braid,cucapra/braid,cucapra/braid,guoyiteng/braid,guoyiteng/braid