diff --git a/src/graphnet/models/graphs/graph_definition.py b/src/graphnet/models/graphs/graph_definition.py
index aa73693ef..9c4db4d47 100644
--- a/src/graphnet/models/graphs/graph_definition.py
+++ b/src/graphnet/models/graphs/graph_definition.py
@@ -150,7 +150,8 @@ def forward(  # type: ignore
         else:
 
             self.warning_once(
-                "No EdgeDefinition provided. Graphs will not have edges defined!"
+                """No EdgeDefinition provided. 
+                Graphs will not have edges defined!"""  # noqa
             )
 
         # Attach data path - useful for Ensemble datasets.