diff --git a/tsg_util/tsg_initialisation.m b/tsg_util/tsg_initialisation.m
index 712136e79667e9bf187d98a617260d3f0bd12e44..42b3b1f4820db53be1a2200959acd4c4e0f98155 100644
--- a/tsg_util/tsg_initialisation.m
+++ b/tsg_util/tsg_initialisation.m
@@ -25,6 +25,12 @@ REFERENCE_DATE_TIME = '19500101000000';
 tsg.levitus.data = [];
 tsg.levitus.type = [];
 
+% -------------------------------------------------------------------------
+%              file field 
+% -------------------------------------------------------------------------
+tsg.file.name = [];
+tsg.file.type = [];
+
 % -------------------------------------------------------------------------
 %              Constants for the quality control procedure
 % -------------------------------------------------------------------------