You could if you want to, and I say, why not? Would you happen to be boiling less than the recipe states, and topping off later? Is the alpha acid percentage of your hops lower than the recipe states? Adding more hops can help for better hop utilization in small boils and bring a low AA% hop to the right IBUs for the beer style.
Chances are, I don't think you will notice much from .25 oz.