When you Ignore Collision, how do you Un-Ignore it?

Unity Engine
1

I want to Ignore Collision only under certain circumstances. But now, once I ignore it, it stays ignored. How do make it effective again? I do not see this in the documentation anywhere.

void Update()
    {
        //if(oneWayCheck)
        if(oneWayCheck == true)
        {
            Physics2D.IgnoreCollision(platformColliders[0], playerBoxCollision);
        }
}
2

Nevermind… I re-read the docs and noticed the 3rd parameter. Sorry for wasting everyone’s time.