The Texans signed free-agent WR Devard Darling and RB Javarris Williams on Friday.
Darling has not played since 2008. In '08 with the Chiefs, he played in 16 games with nine starts and caught 17 balls for 247 yards and a touchdown. In five NFL seasons, he has 578 career receiving yards and four scores.
Williams played in four games with the Chiefs in 2009 and rushed for six yards on six carries.