diff --git a/README.md b/README.md
index 1816b18..606b5b5 100644
--- a/README.md
+++ b/README.md
@@ -171,7 +171,7 @@ The DOF column denotes the number of actuated degrees of freedom.
 | `piper_description`           | PiPER                 | AgileX                   | URDF       | MIT          |
 | `piper_mj_description`        | PiPER                 | AgileX                   | MJCF       | MIT          |
 | `poppy_ergo_jr_description`   | Poppy Ergo Jr         | Poppy Project            | URDF       | GPL-3.0      |
-| `rizon4_description`          | Rizon4                | Flexiv Robotics          | Xacro      | Apache-2.0   |
+| `rizon4_description`          | Rizon4                | Flexiv Robotics          | URDF       | Apache-2.0   |
 | `rizon4_mj_description`       | Rizon4                | Flexiv Robotics          | MJCF       | Apache-2.0   |
 | `sawyer_mj_description`       | Sawyer                | Rethink Robotics         | MJCF       | Apache-2.0   |
 | `so_arm100_description`       | SO-ARM100             | The Robot Studio         | URDF       | Apache-2.0   |