diff --git a/icartt/dataset.py b/icartt/dataset.py
index f76d38e219bb3055d7fc4f8c562bc6bc5cc8a187..470a40bc5d132cda598733986dd8570b70a496b2 100644
--- a/icartt/dataset.py
+++ b/icartt/dataset.py
@@ -352,6 +352,11 @@ class Dataset:
         self.read_data()
 
     def __init__(self, f=None, loadData=True, splitChar=","):
+        '''
+        :param string/file f: file path or file object to use
+        :param bool loadData: load data as well (or only header if False)?
+        :param string splitChar: the splitting character used to separate fields in a line
+        '''
         self.format       = 1001
 
         self.revision     = '0'