Where can i find Documentation for UGameplayEffectCustomApplicationRequirement

I have been looking all over. Visual Studio is having a hard time finding the header in my project, which to be honest it has been doing alot recently, even though everything compiles fine. I know from the Gamplay Attributes and effects section that I need to use this class but i cannot find documentation to save my life

EDIT: Nevermind. I thought it was a native only class but the blueprint lets you override the CanApplyEffect function