diff --git a/gprMax/geometry_outputs.py b/gprMax/geometry_outputs.py
index d1732dd1..5c0fb7c4 100644
--- a/gprMax/geometry_outputs.py
+++ b/gprMax/geometry_outputs.py
@@ -195,6 +195,7 @@ class GeometryView:
                    x, y, z, cellData={"Yee materials": l})
 
     def evtk_voxels(self):
+        """Function to export the user selected voxels to VTK (.vdr)"""
         G = self.G
 
         # sample the solid array