Update README.md

README.md

@@ -33,7 +33,7 @@ Check the here the [TODO list](TODO).
 - [Google collab: hotwheels C wrapper](https://colab.research.google.com/drive/1CjmosUB0a2A3H1YdMe5vNVrFIUSRy8Ow)
 - [Google collab: use the octree with multiple particles per leaf](https://colab.research.google.com/drive/1EObmEt7XK56EpwHh7PQ-viR7PHZ5H0pl)
 - [Google collab: run the octree build on GPU](https://colab.research.google.com/drive/1GmlFxnou2geo_pRzeOMebVVKAIhPZbM9)
-- [A refined PM DMO run with fixed timesteps](run_pm_dmo_NFW_fixed_timestep.md)
+- [A PM DMO run with arbitrary refinement levels and fixed timesteps](run_pm_dmo_NFW_fixed_timestep.md)
 - **soon:** A cosmological PM DMO run with fixed timesteps