diff --git a/returnn/datasets/hdf.py b/returnn/datasets/hdf.py
index 19fdb71e16..9f93c05774 100644
--- a/returnn/datasets/hdf.py
+++ b/returnn/datasets/hdf.py
@@ -547,7 +547,7 @@ def get_seq_length(self, seq_name):
 
     def check_data_integrity(self, data, seq_name):
         """
-        :param data numpy.ndarray
+        :param numpy.ndarray data
         :param str seq_name
         """