diff --git a/qim3d/viz/_cc.py b/qim3d/viz/_cc.py
index f477539a61ce4593ac53a5d5187fe04eaf6309c7..e6e455a961b3dbd35e04506cab2ccfadda4a9517 100644
--- a/qim3d/viz/_cc.py
+++ b/qim3d/viz/_cc.py
@@ -23,7 +23,7 @@ def plot_cc(
         connected_components (CC): The connected components object.
         component_indexs (list | tuple, optional): The components to plot. If None the first max_cc_to_plot=32 components will be plotted. Defaults to None.
         max_cc_to_plot (int, optional): The maximum number of connected components to plot. Defaults to 32.
-        overlay (optional): Overlay image. Defaults to None.
+        overlay (np.ndarray, optional): Overlay image. Defaults to None.
         crop (bool, optional): Whether to crop the image to the cc. Defaults to False.
         display_figure (bool, optional): Whether to show the figure. Defaults to True.
         color_map (str, optional): Specifies the color map for the image. Defaults to "viridis".