diff --git a/src/lbaf/IO/lbsGridStreamer.py b/src/lbaf/IO/lbsGridStreamer.py
index 47c06e76..410016a4 100644
--- a/src/lbaf/IO/lbsGridStreamer.py
+++ b/src/lbaf/IO/lbsGridStreamer.py
@@ -15,7 +15,7 @@ class GridStreamer:
     def __init__(
         self,
         points, # vtk.vtkPoints
-        lines,  # vtk.vtkCellArry
+        lines,  # vtk.vtkCellArray
         field_arrays: Optional[dict] = None,
         point_arrays: Optional[list] = None,
         cell_arrays: Optional[list] = None,