Correct.
Here's an informative article for those who find metallurgy interesting.
http://aluminiuminsider.com/aluminium-scandium-alloys-future/
It takes very little Scandium to result in dramatic strength increases. One aluminum alloy tested was increased in strength by 1500% from the addition of only 0.4% Scandium.
Here's one example from the article.
Very little amount of scandium is needed to improve aluminium alloys properties, less than 1wt% (weight percent). For instance, alloying scandium with aluminium-magnesium alloy increases its yield strength by up to 150% while preserving density and resistance to corrosion. In addition, scandium increases the quality of the alloy’s welded joints, avoiding cracking at welds and increasing fatigue life by up to 200%.
That strength increase was from adding a quarter of one percent (0.25%) scandium to the alloy.