Rhino and Stampede adding dice

[hydrophytic]

In the stampede super power it states, "The next time it makes a Gore attack this turn, add 2 dice to the attack roll." are the 2 dice that are added only for the first instance that Rhino uses the Gore attack, or if he used the Gore attack twice would he had 2 dice to both attacks?

[Thoras]

It will only provide additional dice to the first Gore attack made that turn.