It's official, the Nationals have place Stephen Strasburg on the DL, according to the MLB Blogs network.

The Nationals have placed right-hander Stephen Strasburg on the 15-day disabled list because of shoulder stiffness and activated left-hander Scott Olsen, who is pitching against the Braves on Thursday afternoon.

Strasburg will not throw for the next three or four days, and his right shoulder will be reevaluated by the team after that.

It's important to note that just placing him on the DL doesn't actually mean that his shoulder is any worse than originally reported. The Nationals were going to monitor Strasburg's innings this year, and giving him this break during the season might just be an effective way to do so. More information as it it becomes available.