diff --git a/test_files/copy_number_file.csv b/test_files/copy_number_file.csv
index 6edf372f82d455dbd08d4e0092f70e1e47f48a45..690325102432fce639e42cb900e67a6adac9280c 100644
--- a/test_files/copy_number_file.csv
+++ b/test_files/copy_number_file.csv
@@ -1,4 +1,4 @@
-NewTranscriptID, ID, Count
+ID of transcript, ID of parent transcript, Transcript copy number
 1,1,12
 2,1,11
 3,2,33