diff --git a/pywhy_graphs/algorithms/pag.py b/pywhy_graphs/algorithms/pag.py
index 84a43ea3e..106c60697 100644
--- a/pywhy_graphs/algorithms/pag.py
+++ b/pywhy_graphs/algorithms/pag.py
@@ -911,6 +911,7 @@ def _check_ts_node(node):
         raise ValueError(f"All lag points should be 0, or less. You passed in {node}.")
 
 
+
 def _apply_meek_rules(graph: CPDAG) -> None:
     """Orient edges in a skeleton graph to estimate the causal DAG, or CPDAG.
     These are known as the Meek rules :footcite:`Meek1995`. They are deterministic