diff --git a/modules/util/viirs_l1b_l2.py b/modules/util/viirs_l1b_l2.py
index 06a5d8709ccb451601688454141680022afcc889..514dfe07414c7e95c80aa374536f114ed3cc7f19 100644
--- a/modules/util/viirs_l1b_l2.py
+++ b/modules/util/viirs_l1b_l2.py
@@ -96,6 +96,8 @@ def run_all(directory, out_directory, day_night='ANY'):
     data_train_tiles = []
     f_cnt = 0
 
+    print('Start, number of files: ', len(data_files))
+
     for idx, data_f in enumerate(data_files):
         # if idx % 4 == 0:  # if we want to skip some files
         if True: