remove old comment from docstring
@@ -48,11 +48,6 @@ def gamma_shell(coords_reference, dose_reference,
global_normalisation=None):
"""Compare two dose grids with the gamma index.
- To have this calculate in a timely manner it is recommended to set
- ``maximum_test_distance`` to a value of 2 * ``distance_mm_threshold``. This
- has the downside of having gamma values larger than 2 potentially being
- erroneous.
-
Parameters
----------
coords_reference : tuple
