diff --git a/Convert_Matlab/overlap_v6.py b/Convert_Matlab/overlap_v6.py
index d8cdaaf67d53f297d9327827022062caeced8c2a..ab9ba80464cdc038ba1dcb2899ca382b91ab2a89 100755
--- a/Convert_Matlab/overlap_v6.py
+++ b/Convert_Matlab/overlap_v6.py
@@ -38,7 +38,7 @@ def print_edgelist(id_child):
             # id_child_1 is a scalar int.
             writer.writerow(convert_id(predecessor) + convert_id(id_child_1))
 
-orientation = sys.argv[1]
+orientation = sys.argv[1] # "cyclo" or "anti"
 id_child = sio.loadmat(f"id_child_{orientation}.mat", squeeze_me=True)\
     ["id_child"]