Update README.md (#37)

Author: astomodynamics

README.md

@@ -131,7 +131,7 @@ make test
 
 
 ## ROS 
-If you want to use this library for ROS2 MPC node, please refer [CDDP MPC Package](https://github.com/astomodynamics/cddp_mpc_pkg)
+If you want to use this library for ROS2 MPC node, please refer [CDDP MPC Package](https://github.com/astomodynamics/cddp_mpc). You do not need to install this library to use the package. MPC package will automatically install this library as a dependency.
 
 ## References
 * Zhaoming Xie, C. Karen Liu, and Kris Hauser, "Differential Dynamic Programming with Nonlinear Constraints," 2017 IEEE International Conference on Robotics and Automation (ICRA), 2017.