output of this code? explaination please

Question

Can someone explain this one.
Answer is 16
What is the output of this code?
var sum=0;
for(i=4; i<8; i++) {
if (i == 6) {
continue;
}
sum += i;
}
document.write(sum);

Answer 1

When i=4, sum=0+4=4
i=5, sum=4+5=9
i=6, jump to 7
i=7, sum=9+7=16
End