Azir Slow Stacking

When multiple sand soldiers hit an enemy it says in LoLWikia that the 25% slow for 1 second stacks additively.

Correct me if i'm wrong but does this mean that an opponent hit by two solders is slowed by 50% for 2 seconds, and 75% for 3 seconds when hit by three soldiers?

Would love to know as this makes a big difference to my potential build.

Thanks in advance