diff --git a/datalab/datalab_session/data_operations/normalization.py b/datalab/datalab_session/data_operations/normalization.py
index e250f6e..803fb99 100644
--- a/datalab/datalab_session/data_operations/normalization.py
+++ b/datalab/datalab_session/data_operations/normalization.py
@@ -51,7 +51,7 @@ def operate(self):
             median = np.median(image)
             normalized_image = image / median
 
-            output = create_output(self.cache_key, normalized_image, index=index, comment=f'Product of Datalab Normalization on file {input[index]["basename"]}')
+            output = create_output(self.cache_key, normalized_image, index=index, comment=f'Product of Datalab Normalization on file {input[index-1]["basename"]}')
             output_files.append(output)
             self.set_operation_progress(0.5 + index/len(image_data_list) * 0.4)