diff --git a/km3io/offline.py b/km3io/offline.py
index 4d67707f8b43742f06ca6fc4d6541d1a9dba5ef8..30e1cb3f8b9536817cda4730c2c82d186e8ee2b2 100644
--- a/km3io/offline.py
+++ b/km3io/offline.py
@@ -538,8 +538,7 @@ class OfflineReader:
             yield trk_index, stages_index
 
     def _find_empty(self, array):
-        """finds empty lists/arrays in a chunked-jagged array of data
-        of interest.
+        """finds empty lists/arrays in an awkward array
 
         Parameters
         ----------