Now, in this particular case, things were pretty simple because we didn't have any double bonds. Now what happens if we have one double bond? How can we incorporate the double bond into this name? Well, in the case of one double bond, if we add a double bond anywhere into this hydrocarbon chain besides this location and this location, we basically all we have to do is replace the A with E and so the name becomes hexadecinoic acid. And of course, because we have one double bond, let's say you replace the double bond here. We replace the zero with the one because we have that additional double bond or we have that double bond.