The Texans activated Addison (thigh) from injured reserve Saturday, Aaron Wilson of ProFootballNetwork.com reports.
Addison was forced to miss the first four games of the season after landing on injured reserve due to a thigh injury, but he's set to make his season and team debut in Week 5. The veteran pass rusher has recorded at least five sacks in eight consecutive seasons and will look to continue that streak during his first campaign with Houston.