Does Iron Will change the listed damage?

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As a marauder I like to use Ground Slam, and would like to increase the damage with Iron Will. But when I equip the gem it does not increase the listed damage of the skill. While other support gems like Added Fire Damage and Melee Physical Damage do directly increase the listed damage.
Is there some sort of hidden increase in damage?
Am I misunderstanding the skill here?
Should Iron Will increase the listed damage if it works?
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Deep Rock Galactic | How to use Iron will and Field Medic Properly |
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