"Supportable Skills" Tooltip doesn't include Poisonous Concoction. It should.

After selecting Poisonous Concoction from the ascendancy, a player would expect that skill to show up in the same "Supportable Skills" hover-over tooltip that appears when hovering over support gems in your inventory or stash. However the skill is missing from this tooltip.

This makes it very difficult to know which support gems are compatible with this skill, and should be fixed.