diff --git a/conversion/ctf.py b/conversion/ctf.py
index 5ae4ca7..1edd9f5 100644
--- a/conversion/ctf.py
+++ b/conversion/ctf.py
@@ -4,6 +4,7 @@ import babeltrace
 from pickle import Pickler
 import time
 
+# List of ignored CTF fields
 _IGNORED_FIELDS = [
     'content_size', 'cpu_id', 'events_discarded', 'id', 'packet_size', 'packet_seq_num',
     'stream_id', 'stream_instance_id', 'timestamp_end', 'timestamp_begin', 'magic', 'uuid', 'v'