diff --git a/test/guix_studio_test/test_view/test_utils.py b/test/guix_studio_test/test_view/test_utils.py
index 17e43fb0..ae1849e1 100644
--- a/test/guix_studio_test/test_view/test_utils.py
+++ b/test/guix_studio_test/test_view/test_utils.py
@@ -7,6 +7,7 @@
 # https://opensource.org/licenses/MIT.
 #
 # SPDX-License-Identifier: MIT
+# Some portions generated by Claude Code (Opus 5).
 
 import os
 import sys
@@ -217,7 +218,11 @@ def compare_file(pathname_1, pathname_2, encoding = "", compare_start_string = "
     start_row_2 = 0
     
     if compare_start_string != "":
-        # find the line where comparing starts 
+        # Find the line where comparing starts, independently in each file. The
+        # two files may reach that line at different offsets -- a generated file
+        # carries the Studio banner, while the golden checked in beside it also
+        # carries a licence header -- so each start row must be looked up in its
+        # own list.
         for line in list_1:
             if compare_start_string in line:
                 start_row_1 = list_1.index(line)
@@ -225,7 +230,7 @@ def compare_file(pathname_1, pathname_2, encoding = "", compare_start_string = "
                 
         for line in list_2:
             if compare_start_string in line:
-                start_row_2 = list_1.index(line)
+                start_row_2 = list_2.index(line)
                 break;
 
     # compare from the start line