diff --git a/zesje/images.py b/zesje/images.py
index d4afe7661fc55d9a67960074da430f9b68eed2e6..331a7a087864bf90d6d99f4e34aafb8110f75d34 100644
--- a/zesje/images.py
+++ b/zesje/images.py
@@ -41,7 +41,7 @@ def get_box(image_array, box, padding=0.3):
 def fix_corner_markers(corner_keypoints, shape):
     """
     Corrects the list of corner markers if only three corner markers are found.
-    This function raises if only two corner keypoints are detected.
+    This function raises if less than three corner markers are detected.
 
     Parameters
     ----------