diff --git a/nireports/reportlets/modality/dwi.py b/nireports/reportlets/modality/dwi.py
index 35630e02..5c2c3f2f 100644
--- a/nireports/reportlets/modality/dwi.py
+++ b/nireports/reportlets/modality/dwi.py
@@ -128,7 +128,6 @@ def plot_heatmap(
     return fig
 
 
-
 def rotation_matrix(u, v):
     r"""
     Calculate the rotation matrix *R* such that :math:`R \cdot \mathbf{u} = \mathbf{v}`.