diff --git a/src/moxel/utils.py b/src/moxel/utils.py
index 17e5d66..3d1ae93 100644
--- a/src/moxel/utils.py
+++ b/src/moxel/utils.py
@@ -175,10 +175,6 @@ def calculate(self, cubic_box=False, length=30, potential='lj', n_jobs=None):
         voxels : array of shape (grid_size,)*3
             The energy voxels as :math:`e^{-\beta \mathcal{V}}`, to ensure
             numerical stability.
-        Notes
-        -----
-        For structures that can not be processsed, their voxels are filled with
-        zeros.
         """
         self.cubic_box = cubic_box