It says:
When you gain Haste or refresh its duration you gain (30 to 60) Ward (1 second cooldown) and your Minions gain Haste and Frenzy for 3 Seconds
This only works when I gain haste, not when I refresh its duration.
Tested with Shield Throw (3 points in Fleet of Foot node, which grants 1.5s haste everytime I use Shield Throw).
I kept using Shield Throw, and I only gained ward every 1.5s although the haste icon below was refreshed every time I threw a shield.