diff --git a/data/boxes-udta.csv b/data/boxes-udta.csv
index ed81b9a..b41764f 100644
--- a/data/boxes-udta.csv
+++ b/data/boxes-udta.csv
@@ -40,3 +40,4 @@ urat,User 'star' rating of the media,3GPP
 yrrc,Year when media was recorded,3GPP
 swre,Name and version number of the software that generated this movie,Apple
 diap,Dialogue processing (DialogueProcessingBox),ETSI AC-4
+ctlc,Content type for loudness control,Apple