diff --git a/src/msspec/parameters.py b/src/msspec/parameters.py
index d275c21..5941b22 100644
--- a/src/msspec/parameters.py
+++ b/src/msspec/parameters.py
@@ -1537,7 +1537,7 @@ class CalculationParameters(BaseParameters):
             Parameter('basis_functions', types=str, allowed_values=(
                 'plane_wave', 'spherical'), default='spherical', private=True),
             Parameter('cutoff_factor', types=(int, float),
-                      limits=(1e-4, 999.9999), default=0.01, private=True),
+                      limits=(1e-4, 999.9999), default=0.01, private=False),
             Parameter('mean_free_path', types=(int, float, str),
                       default='SeahDench', allowed_values=('mono', 'SeahDench'),
                       doc="""