diff --git a/km3io/tools.py b/km3io/tools.py
index b9c98efce82b9c913443492b79d9356c49db9cb4..6a683dbdfa73e85a0b2b2b264404f4404bdba0fa 100644
--- a/km3io/tools.py
+++ b/km3io/tools.py
@@ -134,7 +134,7 @@ def get_w2list_param(events, generator, param):
 
     Returns
     -------
-    awkward array
+    awkward.Array
         array of the values of interest.
     """
     if generator == "gseagen":