diff --git a/src/oemof/network/network/nodes.py b/src/oemof/network/network/nodes.py
index bc1e1e7..8cbc983 100644
--- a/src/oemof/network/network/nodes.py
+++ b/src/oemof/network/network/nodes.py
@@ -24,9 +24,18 @@ class Node(Entity):
     inputs: list or dict, optional
         Either a list of this nodes' input nodes or a dictionary mapping input
         nodes to corresponding inflows (i.e. input values).
+        List will be converted to dictionary with values set to None.
     outputs: list or dict, optional
         Either a list of this nodes' output nodes or a dictionary mapping
         output nodes to corresponding outflows (i.e. output values).
+        List will be converted to dictionary with values set to None.
+
+    Attributes
+    ----------
+    inputs: dict
+        A dictionary mapping input nodes to corresponding inflows.
+    outputs: list or dict, optional
+        A dictionary mapping output nodes to corresponding outflows.
     """
 
     def __init__(self, *args, **kwargs):