diff --git a/README.md b/README.md
index 429b5ca907b4859eca1723d11ef7b4d91e158c49..9b17805d6f67a69651a3c3999acb8819374be86a 100644
--- a/README.md
+++ b/README.md
@@ -30,8 +30,9 @@ Check the here the [TODO list](TODO).
 # Tutorials
 
 - [Install and test](install_and_test.md)
+- [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?usp=sharing)
+- [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)
 - **soon:** A cosmological PM DMO run with fixed timesteps