His salary will be the minimum if he sticks around for as long as he sticks around but only 30k of it is guaranteed meaning he can be cut pretty much at any time and it doesn't hurt the team at all. It means it's in his best interest to keep earning his paycheck every single week because every week could be his last with a deal like this.
http://hou.scout.com/story/1534205-all-22-look-on-the-texans-nate-washington, a good look at what Nate brings to the table.
