diff --git a/episodes/instance-segmentation-classic.Rmd b/episodes/instance-segmentation-classic.Rmd
index 10b3d11..fb02901 100644
--- a/episodes/instance-segmentation-classic.Rmd
+++ b/episodes/instance-segmentation-classic.Rmd
@@ -83,7 +83,7 @@ image = viewer.layers["nuclei"].data
 blurred = gaussian(image, sigma=3)
 
 # Add the image to the viewer
-viewer.add_images(blurred)
+viewer.add_image(blurred)
 
 # Compute a threshold
 threshold = threshold_otsu(blurred)