diff --git a/cfpq_data/graphs/creators/relabel_graph.py b/cfpq_data/graphs/creators/relabel_graph.py
index 6cc3530c..2cdf9197 100644
--- a/cfpq_data/graphs/creators/relabel_graph.py
+++ b/cfpq_data/graphs/creators/relabel_graph.py
@@ -15,6 +15,7 @@ def relabel_graph(graph: MultiDiGraph, spec: Dict) -> MultiDiGraph:
     Parameters
     ----------
     graph : MultiDiGraph
+        Initial graph.
 
     spec: Dict
         Edge labels mapping.