diff --git a/km3io/offline.py b/km3io/offline.py
index 800ff05ac6282869faa40e01e911a923d64643ec..6f326516bc9216c8e0c93a6bafc9d9ed4bc5bb5e 100644
--- a/km3io/offline.py
+++ b/km3io/offline.py
@@ -543,7 +543,7 @@ class OfflineReader:
 
         Parameters
         ----------
-        chunk_arr : Chunked array
+        array : awkward array
             Chunked array or jagged array of data of interest. For example:
             km3io.OfflineReader(my_file).tracks.fitinf .