I've noticed a few things while playing this game, as well as several other games of the same type. League's in-client champion info page doesn't really display any information regarding the spells and passives of champions. Two of the biggest examples I can think of right now are Aurelion Sol and Gangplank.
Aurelion Sol's Q detonates in 1 of 2 ways: It reaches its max distance, or it's activated again. But the [in-client description only makes note of the distance method](http://puu.sh/ognqg/9e8e76b9ff.jpg).
Similarly, Gangplank's new passive allows him to collect dubloons in order to modify his ultimate. However, his in-client description [neglects to even mention the dubloons](http://puu.sh/ognrv/22315b78b4.jpg). Not even his [Tips tab](http://puu.sh/ognOa/99cef288a0.jpg) talks about the dubloons at all.
As it stands right now, the only way to completely understand how each character works in to watch a video of how they play, and then to read the spell description in-game when they're supposed to be actually playing, or find somewhere else online that has a full description of the spells.