Power Stone Skill Points (The Witcher 3: Wild Hunt)

Maybe someone does not know that the first time you visit the stone of Strength, you can get one skill point, for
this you need to hold the E key, after which a message will appear that you have received one skill point,
after which the stone icon on the map turns gray.
If someone has already visited the stones of Strength, but received only a temporary effect, he can return to them and
get a skill point (but for this the stones must be light on the map).