Renekton W doesn't say that it gives 50 range but it does
Quote from the Wiki, "ACTIVE: Renekton's next basic attack gains 50 bonus range and strikes his target twice, Stun icon stunning them for 0.75 seconds and dealing modified physical damage. Each hit applies on-hit effects and grants Fury. Hitting an enemy champion grants 10 bonus Fury." However, in-game there is not mention of the 50 range unless you are consciously looking at your range indicator.