diff --git a/python/hccd/path_tracker.py b/python/hccd/path_tracker.py
index 0af85b6..1013ad3 100644
--- a/python/hccd/path_tracker.py
+++ b/python/hccd/path_tracker.py
@@ -43,6 +43,7 @@ class PathTracker:
 
         raise RuntimeError("Newton corrector did not converge")
 
+    # TODO: Make sure the implementation with null_space instead of QR is correct
     def _perform_euler_predictor_step(self, y, step_size) -> typing.Tuple[np.ndarray, np.ndarray]:
         # Obtain y_prime