diff --git a/src/anemoi/training/losses/nodeweights.py b/src/anemoi/training/losses/nodeweights.py
index 909de1f2..e229b71b 100644
--- a/src/anemoi/training/losses/nodeweights.py
+++ b/src/anemoi/training/losses/nodeweights.py
@@ -108,6 +108,20 @@ class ReweightedGraphNodeAttribute(GraphNodeAttribute):
     """
 
     def __init__(self, target_nodes: str, node_attribute: str, scaled_attribute: str, weight_frac_of_total: float):
+        """Initialize reweighted graph node attribute.
+
+        Parameters
+        ----------
+        target_nodes: str
+            name of nodes, key in HeteroData graph object
+        node_attribute: str
+            name of node weight attribute, key in HeteroData graph object
+        scaled_attribute: str
+            name of node attribute defining the subset of nodes to be scaled, key in HeteroData graph object
+        weight_frac_of_total: float
+            sum of weight of subset nodes as a fraction of sum of weight of all nodes after rescaling
+
+        """
         super().__init__(target_nodes=target_nodes, node_attribute=node_attribute)
         self.scaled_attribute = scaled_attribute
         self.fraction = weight_frac_of_total