added more detail to explanation why only torque

franka_hw/include/franka_hw/franka_combinable_hw.h

@@ -23,8 +23,9 @@ namespace franka_hw {
  * A hardware class for a Panda robot based on the ros_control framework.
  * This class is ready to be combined with other hardware classes e.g. to
  * control mulitple robots from a single controller.
- * Note: This class allows for torque (effort) control only (see documentation at
- * https://frankaemika.github.io/docs/franka_ros.html ).
+ * Note: This class allows for torque (effort) control only due to the lack of synchronization
+ * between master controllers of different robots. For more information see the documentation at
+ * https://frankaemika.github.io/docs/franka_ros.html .
  */
 class FrankaCombinableHW : public FrankaHW {
  public: