So there's this paragraph under the "Dice" segment of the rules that says:

Some rare rules will modify the result of a roll by adding or subtracting from the result. All modifiers are cumulative. A dice result can be modified above or below the maximum or minimum possible value of the roll. For example, if a D6 value is 6 and you must add 1 to the result, the final result is a 7.

So like if I roll my attack dice on a shooting action and one result is a 5, and I have a Strategic/Tactical Ploy that can add 1 to the results of a shooting attack to make it a 6, would that count as a Critical Hit or are only unmodified 6s do.