diff --git a/doc/index.rst b/doc/index.rst
index 98e7d597..235ee91d 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -155,7 +155,7 @@ The *gazebo_ros2_control* ``<plugin>`` tag also has the following optional child
 * ``<robot_param>``: The location of the ``robot_description`` (URDF) on the parameter server, defaults to ``robot_description``
 * ``<robot_param_node>``: Name of the node where the ``robot_param`` is located, defaults to ``robot_state_publisher``
 * ``<parameters>``: YAML file with the configuration of the controllers
-* ``<hold_joints>``: if set to true (default), it will hold the joints' position if the interface was not claimed, e.g., the controller hasn't been activated yet.
+* ``<hold_joints>``: if set to true (default), it will hold the joints' position if their interface was not claimed, e.g., the controller hasn't been activated yet.
 
 Default gazebo_ros2_control Behavior
 -----------------------------------------------------------