diff --git a/src/ansys/dpf/core/data_sources.py b/src/ansys/dpf/core/data_sources.py
index ab481e0b7d..c93875b7bc 100644
--- a/src/ansys/dpf/core/data_sources.py
+++ b/src/ansys/dpf/core/data_sources.py
@@ -63,11 +63,11 @@ class DataSources:
 
     Parameters
     ----------
-    result_path :
+    result_path : str or os.PathLike object, optional
         Path of the result. The default is ``None``.
-    data_sources :
+    data_sources : ansys.grpc.dpf.data_sources_pb2.DataSources
         gRPC data sources message. The default is ``None``.
-    server :
+    server
         Server with the channel connected to the remote or local instance. The
         default is ``None``, in which case an attempt is made to use the global
         server.
@@ -85,12 +85,7 @@ class DataSources:
 
     """
 
-    def __init__(
-        self,
-        result_path: Optional[str, os.PathLike] = None,
-        data_sources: Optional[dpf.DataSources, int, DataSourcesPB2.DataSources] = None,
-        server: Optional[type[server_types.BaseServer]] = None,
-    ):
+    def __init__(self, result_path=None, data_sources=None, server: Optional[type[server_types.BaseServer]] = None):
         """Initialize a connection with the server."""
         # step 1: get server
         self._server = server_module.get_or_create_server(